Year	current US$
1975	11752247.81
1976	8046682.358
1977	11375000
1978	14708333.02
1979	17458333.97
1980	31416666.03
1981	51500000
1982	59958332.06
1983	73875000
1984	80125000
1985	53673469.54
1986	28694444.66
1987	21000000
1988	24507316.59
1989	19482353.21
1990	2000000
1991	2752941.17647059
1992	3788235.29411765
1993	1495020.64685806
1994	1316471.43460927
1995	1311410.17926108
2011	200801102.097946
2012	223359863.777552
2013	215938588.68501
2014	253005294.702057
2015	289580106.26014
2016	372027289.650098
2017	378969976.474791
2018	358572056.458286
2019	251772738.316974
2020	265798076.426376
2021	195912826.368675
2022	170713961.902321