This is how the worlds reserve currencies has looked historically. My personal guess is that the Yuan will be the next bar in the graph.
<a href="http:&#x2F;&#x2F;azizonomics.com&#x2F;2012&#x2F;01&#x2F;04&#x2F;a-history-of-reserve-currencies-in-one-graph&#x2F;" rel="nofollow">http:&#x2F;&#x2F;azizonomics.com&#x2F;2012&#x2F;01&#x2F;04&#x2F;a-history-of-reserve-curre...</a>