What was the growth rate of CTV in EMEA in 2021 
ed about the international prospects. So I'm always -- I start macro, which is we're a few years away from being at that $1 trillion TAM. And roughly 60-plus percent of that is outside of the United States or outside of North America.
So of course, we want to capture that opportunity. And because we work with the biggest brands in the world who advertise all over the world, they don't want 200 DSPs as partners. They would like one to take them all over the world and especially to use their learnings in any market to benefit all the other markets. And so as, of course, you know, our focus has been on expanding CTV all over the world.
CTV more than doubled across APAC. CTV in EMEA grew by more than four times in 2021. Shanghai and Hong Kong have been driving our growth in Northern Asia Pacific and just some amazing partnerships across APAC, with Samsung smart TV devices now reaching over 50 million viewers, and thus having access there. Xiaomi in India or Disney+ Hotstar in India.
Again, China was our fastest-growing office again, which when the numbers are small, that's less significant. But when you do it over and over again, it continues to be especially significant. Especially when you look at China and just say that's the second-largest media market in the world, it's roughly half the size of the U.S., but it's growing at twice the pace. So with that being true, we think that represents a tremendous opportunity.
And that we're in a unique position to many others who are looking at that market in that we are representing the largest brands in the world who wants to spend in China. So unlike many other non-China-based companies who have been hurt by trying to go into market in China, we come to the market mostly with a focused spend in market and then to do extension where Chinese brands and products will reach all over the rest of the world, which, of course, they want more distribution. So I'm very encouraged by the fact that we've seen all this growth in those areas. But I can't underscore enough how important it is for us to continue to lead in CTV.
We believe we've done that in the U.S., and we've proved that in the U.S. and Australia arguably years ago in 2020. In 2021, I think we started to show amazing green shoots across other markets in EMEA, most notably in the U.K. and Germany.
So with all of the progress of CTV around the world and the pressure on content owners, that is sometimes slightly different in other markets, but the general trend that is happening in the U.S. is happening there, too, just with slightly less content. But that makes AVOD even more valuable in some way that makes the ads more scarce, but it makes auction dynamics and real-time pricing even more valuable for those markets, which we think then just lends to our business model. So we expect to continue to lead in CTV around the world. 
Blake Grayson -- Chief Financial Officer
And then following up on your Q4 question. The quarter was fundamentally really strong. We have the hardest comp that -- in a long time in Q4 -- comparing against Q4 of '20, not just because of the elections, but also because we had that ramp back out of COVID that was a real accelerator for us in 2020. So thinking about those issues, I think that the Q4 looked really good.
No supply chain issues to call out at all. I think another data point is if you just look at a two-year simple stack on growth rates in Q4, just the year-over-year '20 and '21, Q4 was faster than the full year for us. And so it just goes to the strength and the momentum that we've seen in that we've now kind of disclosed now into our guidance. So we're really excited about it.
Brent Thill -- Jefferies -- Analyst
Thanks. 
Operator
Thank you. Our final question comes from Matt Swanson at RBC. Your line is live.
Matt Swanson -- RBC Capital Markets -- Analyst
All right. Thank you, guys, so much for squeezing me in here. I'll ask two quickly. The first for Jeff.
Thinking about ramp time for shopper data -- and kind of in two ways: one, as far as how long it takes a partnership like what we're seeing w
ed about the international prospects. So I'm always -- I start macro, which is we're a few years away from being at that $1 trillion TAM. And roughly 60-plus percent of that is outside of the United States or outside of North America.
So of course, we want to capture that opportunity. And because we work with the biggest brands in the world who advertise all over the world, they don't want 200 DSPs as partners. They would like one to take them all over the world and especially to use their learnings in any market to benefit all the other markets. And so as, of course, you know, our focus has been on expanding CTV all over the world.
CTV more than doubled across APAC. CTV in EMEA grew by more than four times in 2021. Shanghai and Hong Kong have been driving our growth in Northern Asia Pacific and just some amazing partnerships across APAC, with Samsung smart TV devices now reaching over 50 million viewers, and thus having access there. Xiaomi in India or Disney+ Hotstar in India.
Again, China was our fastest-growing office again, which when the numbers are small, that's less significant. But when you do it over and over again, it continues to be especially significant. Especially when you look at China and just say that's the second-largest media market in the world, it's roughly half the size of the U.S., but it's growing at twice the pace. So with that being true, we think that represents a tremendous opportunity.
And that we're in a unique position to many others who are looking at that market in that we are representing the largest brands in the world who wants to spend in China. So unlike many other non-China-based companies who have been hurt by trying to go into market in China, we come to the market mostly with a focused spend in market and then to do extension where Chinese brands and products will reach all over the rest of the world, which, of course, they want more distribution. So I'm very encouraged by the fact that we've seen all this growth in those areas. But I can't underscore enough how important it is for us to continue to lead in CTV.
We believe we've done that in the U.S., and we've proved that in the U.S. and Australia arguably years ago in 2020. In 2021, I think we started to show amazing green shoots across other markets in EMEA, most notably in the U.K. and Germany.
 So with all of the progress of CTV around the world and the pressure on content owners, that is sometimes slightly different in other markets, but the general trend that is happening in the U.S. is happening there, too, just with slightly less content. But that makes AVOD even more valuable in some way that makes the ads more scarce, but it makes auction dynamics and real-time pricing even more valuable for those markets, which we think then just lends to our business model. So we expect to continue to lead in CTV around the world. 
Blake Grayson -- Chief Financial Officer
And then following up on your Q4 question. The quarter was fundamentally really strong. We have the hardest comp that -- in a long time in Q4 -- comparing against Q4 of '20, not just because of the elections, but also because we had that ramp back out of COVID that was a real accelerator for us in 2020. So thinking about those issues, I think that the Q4 looked really good.
No supply chain issues to call out at all. I think another data point is if you just look at a two-year simple stack on growth rates in Q4, just the year-over-year '20 and '21, Q4 was faster than the full year for us. And so it just goes to the strength and the momentum that we've seen in that we've now kind of disclosed now into our guidance. So we're really excited about it.
Brent Thill -- Jefferies -- Analyst
Thanks. 
Operator
Thank you. Our final question comes from Matt Swanson at RBC. Your line is live.
Matt Swanson -- RBC Capital Markets -- Analyst
All right. Thank you, guys, so much for squeezing me in here. I'll ask two quickly. The first for Jeff.
Thinking about ramp time for shopper data -- and kind of in two ways: one, as far as how long it takes a partnership like what we're seeing w