Year	current US$
1970	18352879.1565288
1971	17865484.5439029
1972	16545259.1729279
1973	17842359.2162666
1974	19316917.2247739
1975	20078377.2580504
1976	23168202.4169184
1977	25766323.024055
1978	29720840.6598007
1979	35966336.9495852
1980	40264193.3670601
1981	40599020.0661467
1982	44961264.8221344
1983	45696498.0544747
1984	35614551.2095669
1985	32857696.8854059
1986	34413869.0573407
1987	17754956.570611
1988	17980293.3231334
1989	10023355.2455531
1990	7635926.6518511
1991	4811638.85806199
1992	4980488.48734661
1993	5017752.48549627
1994	5838678.40481192
1995	11888249.9230765
1996	14716584.0210495
1997	17485698.1091142
1998	19058125.297442
1999	18076815.423945
2000	19170411.7132484
2001	19746046.2424321
2002	19459798.2850423
2003	19031261.2510847
2004	18895525.1924746
2005	18428179.7731656
2006	51483430.2084254
2007	61515780.2260007
2008	61517294.4585186
2009	66812247.9914724
2010	87844337.0083073
2011	94238705.9205957
2012	97057668.4447861
2013	104723395.104897
2014	106872271.389122
2015	113224718.176657
2016	114156617.272343
2017	120611838.500976
2018	130882434.859471
2019	134451933.944181
2020	162135382.174586
2021	277922981.528191