Year	current US$
1990	427508892.389098
1991	404003855.677562
1992	319091317.477756
1993	257163910.998462
1994	260950481.134965
1995	248568916.321399
1996	273777600.526117
1997	277645804.909363
1998	278014993.931485
1999	271412904.788465
2000	276939239.969256
2001	298477213.284735
2002	301283787.041104
2003	355958247.205308
2004	375502668.632124
2005	400877411.957413
2006	391890134.299831
2007	514549885.886988
2008	493814399.866024
2009	415643033.886181
2010	542986609.288771
2011	541981795.258965
2012	524773100.881477
2013	624526448.619299
2014	604053397.789258
2015	540369605.212521
2016	574225744.773468
2017	625239586.779222
2018	600218371.296418
2019	415129425.945384
2020	395138156.961623
2021	421354587.005126