Year	current US$
1970	170277613.060387
1971	211092152.468934
1972	346672909.965031
1973	564833703.665738
1974	2722612098.16813
1975	2692250458.00534
1976	2679228434.51634
1977	2980290064.21515
1978	2756093080.3168
1979	7995112314.94995
1980	8746119573.20104
1981	5808629219.8775
1982	2648326743.04863
1983	4476747615.11184
1984	5075644706.837
1985	5266732151.16388
1986	1871974690.89725
1987	3648132005.20419
1988	2955331458.75985
1989	3793277758.96233
1990	4649007364.04475
1991	3538978596.87287
1992	4951199766.1404
1993	6387827188.7861
1994	5552543223.48516
1995	5180456012.51948
1996	9078069521.90911
1997	9006830068.44284
1998	6003149645.2089
1999	7489752064.64123
2000	18259526511.4213
2001	15145529256.8621
2002	11001976070.4526
2003	21706778703.8866
2004	23225507303.3088
2005	35799360868.1063
2006	19865055563.4962
2007	18148092375.2456
2008	27789441452.5864
2009	4817699515.66048
2010	4341020520.67867
2011	6161335750.03183
2012	3572161305.09881
2013	4849851638.12416
2014	6381502981.31582
2015	460037441.021334
2016	1864161093.64149
2017	3430200508.77278
2018	6954301193.47042
2019	7165408034.53335
2020	3637044340.07259
2021	27270930121.2219