Year	current US$
1990	462526010.668002
1991	437695270.986743
1992	467327339.93459
1993	451064795.4695
1994	452539546.558128
1995	508205111.379239
1996	487146521.970913
1997	421359881.130908
1998	423727826.292866
1999	406948346.467303
2000	358710337.738958
2001	369637844.76066
2002	429554610.950548
2003	488776801.479812
2004	543269175.568076
2005	523502725.53401
2006	533089931.909346
2007	603332788.647021
2008	673955562.654845
2009	658717590.389924
2010	603805496.845571
2011	604140659.049286
2012	567476935.000746
2013	566380673.481192
2014	543903693.501989
2015	429974868.534486
2016	425635767.042946
2017	448925561.40519
2018	490607147.099213
2019	486210010.099136
2020	494508131.294242
2021	514966485.655703