Year	current US$
1990	176230037.82975
1991	171127382.272404
1992	181669686.478057
1993	196665602.145203
1994	202367269.127872
1995	204857366.949215
1996	200560234.24181
1997	190475159.004449
1998	174180419.684463
1999	123742298.179471
2000	119412008.890832
2001	124758447.516858
2002	121775892.935198
2003	137619274.277503
2004	174020678.867357
2005	222588817.967148
2006	291704039.433266
2007	363963522.923724
2008	432808067.909662
2009	347335017.695444
2010	419690236.508436
2011	504240072.549803
2012	501576470.098585
2013	522197271.895924
2014	453270982.298106
2015	364921642.755014
2016	256362324.574564
2017	285678761.002458
2018	301868884.632045
2019	300412645.218499
2020	292063036.668552
2021	330475263.431423