Year	current US$
1970	4985946.14396987
1971	6308749.62951393
1972	6349742.01725192
1973	13314012.1879589
1974	17247491.0682226
1975	19237935.1028807
1976	19764825.6869502
1977	17797043.2955678
1978	24776691.8618152
1979	21141780.2961864
1980	21618627.009871
1981	15422907.4778965
1982	19231597.1193885
1983	16051020.527758
1984	12110882.6625933
1985	14991484.6409841
1986	23999397.6267965
1987	16298388.8413234
1988	16242112.4299245
1989	20921270.0700383
1990	16817305.8259101
1991	17306714.1520729
1992	16858954.3957259
1993	21477316.2554324
1994	22900392.4703444
1995	23825073.213089
1996	21831805.2828276
1997	24021057.7387984
1998	22780642.3194724
1999	28059420.6576811
2000	24317365.5636036
2001	24000592.8261707
2002	37154940.7071314
2003	27992261.61635
2004	18430771.5486467
2005	18366320.7533302
2006	27412476.4839536
2007	28360912.2041023
2008	29740691.7969004
2009	27859959.8845904
2010	45854747.837775
2011	44379695.0525628
2012	42772765.4246332
2013	43627602.7507315
2014	44509257.9568853
2015	46968909.3459635
2016	51827732.1167124
2017	43999373.0991377
2018	44220700.0675636
2019	51729326.4647272
2020	48382573.1932215
2021	47376783.1840884