Year	current US$
1998	13562081706.9499
1999	15270034267.5468
2000	11083711631.1423
2001	8337127829.7759
2002	7381962331.8735
2003	7642566255.64775
2004	9450651003.95275
2005	11619354728.6379
2006	12776494216.9178
2007	17985834118.4352
2008	22575730919.9581
2009	27236828134.9799
2010	40919563274.0509
2011	48052039160.8417
2012	54032504086.7659
2013	59539164361.1457
2014	67674861750.9334
2015	74303403461.0591
2016	73792830153.391
2017	52546736512.288
2018	42195515525.4447
2019	48564113123.503
2020	47785347371.4739
2021	49922061225.8116