Lets not rush ahead of ourselves! The 2015-2020 figures in the IMF April 2015 WEO update are only forecasts. It is only the 2014 figures that are confirmed.
0 European Union 18,495,349
1 United States 17,418,925
2 China 10,380,380
3 Japan 4,616,335
4 Germany 3,859,547
5 United Kingdom...