Year	current US$
1970	14976929.7649727
1971	15387454.3246187
1972	15445727.4076574
1973	15990893.0117241
1974	38837504.616235
1975	26917889.4705116
1976	28367631.9633569
1977	38498101.2135734
1978	39644728.9312045
1979	36723721.5929374
1980	39159544.9739037
1981	43322941.5627834
1982	36297028.119245
1983	31251542.1726267
1984	35253927.4927798
1985	24137983.2457604
1986	23981411.9885682
1987	21126362.4826802
1988	20628605.0353384
1989	32916060.9216431
1990	37754756.7671311
1991	43080161.5653641
1992	40135305.1738059
1993	30207201.0697406
1994	31099730.9634403
1995	20783916.3952186
1996	29309842.651897
1997	25380873.6813359
1998	24294911.8154206
1999	17750995.4837051
2000	17856705.1499899
2001	20707924.8661517
2002	17292952.6234562
2003	16097512.1323655
2004	28628224.0476569
2005	39036365.9480363
2006	58467161.8135957
2007	66530763.4857689
2008	47305485.9434557
2009	14195179.3478941
2010	17636714.8133973
2011	29544615.3888364
2012	20883833.4072183
2013	19111503.0126455
2014	19141312.3238211
2015	18669738.8097506
2016	15068818.3886175
2017	22739898.4487192
2018	26540387.8508427
2019	0
2020	0
2021	0