Year	current US$
1970	20939999.986439947
1971	29050000.302493572
1972	26800000.250339508
1973	29540000.25615101
1974	26189999.327063575
1975	25779999.732971232
1976	19550000.10877847
1977	25940000.62346462
1978	12089999.645948403
1979	23249999.88079068
1980	16949999.928474423
1981	6520000.010728826
1982	25870000.12397762
1983	4629999.995231636
1984	5030000.030994409
1985	17560000.00238418
1986	8969999.760389328
1987	8260000.050067897
1988	21590000.51021579
1989	13439999.967813494
1990	41099999.666213974
1991	11249999.89569187
1992	15210000.27656555
1993	13249999.64237214
1994	14819999.426603317
1995	11859999.835491175
1996	2300000.011920931
1997	319999.9891221525
1998	1630000.0324845302
1999	2559999.94277954
2000	3210000.03814697
2001	720000.028610229
2002	649999.976158142
2003	689999.9938905234
2004	9999.99977648258
2005	2900000.09536743
2006	1700000.04768372
2007	1389999.98569489
2008	1320000.05245209
2009	1080000.04291534
2010	50000.0007450581
2011	5429999.82833862
2012	1360397.5772857699
2013	2652304.962277416
2014	4185130.00011444
2015	960562.9965662957
2016	1684064.9545192749
2017	3280.0000626593796
2018	4361876.48773193
2019	6536079.88357544
2020	3794232.36846924
2021	2375129.93812561
2022	4221312.284469607