Passage: Colombia over the last decade has experienced a historic economic boom. In 1990, Colombia was Latin America's 5th largest economy and had a GDP per capita of only US$1,500, by 2015 it became the 4th largest in Latin America, and the world's 31st largest. As of 2015 the GDP (PPP) per capita has increased to over US$14,000, and GDP (PPP) increased from US$120 billion in 1990 to nearly US$700 billion. Poverty levels were as high as 65% in 1990, but decreased to under 24% by 2015.Modern industries like shipbuilding, electronics, automobile, tourism, construction, and mining, grew dramatically during the 2000s and 2010s, however, most of Colombia's exports are still commodity-based. Colombia is Latin America's 2nd-largest producer of domestically-made electronics and appliances only behind Mexico. Colombia had the fastest growing major economy in the western world in 2014, behind only China worldwide.Since the early 2010s, the Colombian government has shown interest in exporting modern Colombian pop culture to the world (which includes video games, music, movies, TV shows, fashion, cosmetics, and food) as a way of diversifying the economy and entirely changing the image of Colombia; a national campaign similar to the Korean Wave. In the Hispanic world, Colombia is only behind Mexico in cultural exports and is already a regional leader in cosmetic and beauty exports.The number of tourists in Colombia grows by over 12% every year. Colombia is projected to have over 15 million tourists by 2023.

Question: What global rank did Colombia's economy hold in 2015?
31st largest