Year	current US$
1970	70538.6398319892
1971	1670520.03011088
1972	2089023.30728446
1973	1828771.06664724
1974	5626250.40876162
1975	15785941.0943863
1976	13909263.4681559
1977	14626437.5289046
1978	15162069.5994707
1979	13887307.228335
1980	18778288.1893724
1981	29320876.8252554
1982	29655343.0151924
1983	15650161.0871062
1984	9988489.82678881
1985	12543242.6546645
1986	5086110.41337583
1987	3513619.09991401
1988	4017004.78113254
1989	5505705.53644702
1990	10557246.5005455
1991	6577230.01196519
1992	3679410.9572178
1993	3984491.74335273
1994	4067408.59308746
1995	8020813.70175052
1996	8724371.37884361
1997	6742119.73381491
1998	1826697.67179968
1999	1985084.31283003
2000	7093736.63113629
2001	9939883.4981661
2002	6425439.05325608
2003	7340738.68927503
2004	17141541.8155748
2005	11225231.0401972
2006	14584170.4146855
2007	14035201.2249027
2008	36195488.2495139
2009	12505564.4081173
2010	19426773.5164071
2011	26042418.1634803
2012	15888737.932245
2013	9704824.34263684
2014	6600679.60414464
2015	3615161.94951999
2016	2887148.12400054
2017	4825066.65722949
2018	4266031.17298913
2019	3744408.96922566
2020	1322137.29528939
2021	3675825.78543546