Year	current US$
1974	516666.622937266
1975	612725.573293149
1976	511110.382109944
1977	489567.073966677
1978	723388.8689052351
1979	1370465.97407822
1980	1072720.7227652601
1981	994805.54160686
1982	1148819.659615503
1983	1129084.11356215
1984	1096047.5684999549
1985	1170288.425873945
1986	3016402.682497858
1987	1647260.6195685975
1988	1459290.429679962
1989	2418340.8898130897
1990	2890000
1997	6604310
1998	6172364.3
1999	11951327.5
2000	12986809.1
2001	7529946.8542
2002	8319141.04
2003	8923123.251283864
2004	9321531.523817956
2005	8860492.166415796
2006	8135037.2638593055
2007	6428170
2008	9368286.968080396
2009	10072695.18495164
2010	13020548.098225798
2011	18003486.601998035
2012	17423692.8117636
2013	36032488.4417055
2014	69525419.95352088
2015	77439300.43385457
2016	82019550.8753645
2017	71592694.4410623
2018	73928168.98173551
2019	48567670.9280419
2020	23653084.924150903
2021	38218764.8541175
2022	54140295.8026395