Year	constant 2021 US$
1973	449999.988079071
1974	19600000.3814697
1975	35290000.9155273
1976	19610000.6103516
1977	21129999.1607666
1978	27260000.2288818
1979	28489999.7711182
1980	45770000.4577637
1981	40060001.373291
1982	44630001.0681152
1983	27600000.3814697
1984	42189998.626709
1985	47040000.9155273
1986	27979999.5422363
1987	31409999.8474121
1988	33560001.373291
1989	43310001.373291
1990	30809999.4659424
1991	27370000.8392334
1992	18540000.915527303
1993	14350000.3814697
1994	27590000.1525879
1995	29590000.1525879
1996	57439998.626709
1997	19079999.9237061
1998	28510000.2288818
1999	12380000.1144409
2000	21079999.9237061
2001	30299999.237060502
2002	41220001.220703095
2003	14100000.3814697
2004	32979999.5422363
2005	25440000.5340576
2006	22860000.6103516
2007	18620000.8392334
2008	20469999.3133545
2009	35340000.1525879
2010	33110000.6103516
2011	22889999.3896484
2012	26040000.915527303
2013	19799999.237060502
2014	15989999.7711182
2015	13270000.4577637
2016	9529999.73297119
2017	21600000.3814697
2018	28979999.5422363
2019	56240001.6784668
2020	68519996.6430664
2021	79069999.6948242
2022	62479999.5422363