Year	current US$
1979	1159999.9666214
1980	11600000.3814697
1981	15539999.961853001
1982	18299999.237060502
1983	20659999.8474121
1984	15369999.8855591
1985	14420000.076293899
1986	17329999.9237061
1987	27719999.3133545
1988	31239999.7711182
1989	30559999.4659424
1990	39830001.8310547
1991	35759998.3215332
1992	35479999.5422363
1993	30760000.2288818
1994	25170000.0762939
1995	28860000.6103516
1996	22430000.3051758
1997	26760000.2288818
1998	14380000.1144409
1999	15539999.961853001
2000	12729999.5422363
2001	8880000.11444092
2002	9649999.61853027
2003	8600000.38146973
2004	8960000.03814697
2005	9350000.38146973
2006	8460000.03814697
2007	9819999.69482422
2008	7739999.771118159
2009	7679999.82833862
2010	6260000.228881841
2011	5820000.17166138
2012	4658359.52758789
2013	3655304.90875244
2014	3485530.3764343304
2015	2182770.25222778
2016	2048055.1719665502
2017	1295327.42500305
2018	767553.329467773
2019	579316.794872284
2020	-138634.666800499
2021	412066.93649292
2022	392129.48083877604