Year	current US$
1972	27329999.9237061
1973	10189999.5803833
1974	19200000.762939498
1975	29100000.3814697
1976	18219999.3133545
1977	23020000.4577637
1978	26379999.1607666
1979	39340000.1525879
1980	27569999.6948242
1981	24700000.762939498
1982	21920000.0762939
1983	17799999.237060502
1984	10890000.3433228
1985	16739999.7711182
1986	22450000.762939498
1987	41799999.237060495
1988	17250000
1989	23309999.4659424
1990	26219999.3133545
1991	36040000.9155273
1992	47810001.373291
1993	26829999.9237061
1994	25239999.7711182
1995	26450000.762939498
1996	28290000.915527303
1997	33040000.915527303
1998	20030000.6866455
1999	25170000.0762939
2000	31850000.3814697
2001	28379999.1607666
2002	14949999.8092651
2003	35060001.373291
2004	26629999.1607666
2005	23889999.3896484
2006	38380001.0681152
2007	11789999.961853001
2008	38110000.6103516
2009	46430000.3051758
2010	36259998.3215332
2011	33720001.220703095
2012	41659999.8474121
2013	44340000.1525879
2014	49099998.4741211
2015	33259998.321533203
2016	30020000.4577637
2017	46779998.779296905
2018	51029998.779296905
2019	50560001.373291
2020	54419998.1689453
2021	54150001.5258789
2022	36060001.373291