Year	current US$
1979	3589619.16
1980	4890186.787
1981	9302308.083
1982	8086236
1983	7984107.971
1984	10613370.9
1985	27653663.64
1986	29747564.32
1987	27012722.02
1988	22653249.74
1989	22988763.81
1990	21945989.61
1991	19179191.59
1992	22688095.09
1993	26138704.3
1994	29642278.67
1995	32709172.7897607
1996	33349960.80667
1997	34633833.7922316
1998	25870529.9096544
1999	23202386.2410357
2000	43301333.1093052
2001	77584872.3115981
2002	99401919.4141246
2003	123678440.647543
2004	172645209.913264
2005	203312108.144442
2006	204579736.184735
2007	183212478.678858
2008	146677339.874132
2009	171057209.50972
2010	175631133.068789
2011	160556654.461292
2012	190607858.301268
2013	203570068.858917
2014	220967734.417278
2015	252357499.976782
2016	272362581.415721
2017	278737964.141094
2018	290061565.17025
2019	286567812.122624
2020	317155615.856279
2021	393635198.843453
2022	458827402.287967
2023	500000000