Year	current US$
1970	25334579.4991287
1971	23313591.4445422
1972	27975364.600219
1973	54371304.6485375
1974	39402300.9386594
1975	52695495.9936373
1976	48015310.0720619
1977	64240765.1118874
1978	105267601.755983
1979	149463834.060225
1980	188825951.257399
1981	172806941.599245
1982	173425065.966678
1983	167726808.089105
1984	152553104.330686
1985	88697498.5775213
1986	131676172.720193
1987	167610132.910443
1988	173015592.556543
1989	168234581.322465
1990	270818783.24967
1991	213087199.484699
1992	188375898.585882
1993	201402585.875121
1994	120358650.845146
1995	134837929.114136
1996	168575270.985331
1997	171617705.566491
1998	90410869.5534114
1999	85340780.9975913
2000	88653750.0541643
2001	65383702.7229054
2002	64813093.2541114
2003	71986751.088974
2004	54541285.5656339
2005	16452465.212586
2006	55427342.8028857
2007	80231062.279037
2008	64321448.2047429
2009	89205413.185712
2010	63960386.139315
2011	73179717.1633093
2012	78450857.1159218
2013	98448142.2228837
2014	278067375.615002
2015	239293302.213065
2016	280648805.84461
2017	366760637.161993
2018	221495522.966488
2019	427023187.423404
2020	478467665.052908
2021	545357971.925459