Year	current US$
1968	2259999.93830919
1969	5780000.09991229
1970	6209999.94687736
1971	7070000.15676022
1972	7109999.96960163
1973	6639999.98569489
1974	6030000.06824732
1975	7099999.9418854695
1976	6490000.08776784
1977	6789999.97116625
1978	8600000.13932586
1979	10289999.9581277
1980	9849999.8152256
1981	10749999.7466803
1982	7999999.79138374
1983	5160000.01132488
1984	4199999.9582767505
1985	4130000.0436603995
1986	4559999.96885657
1987	5189999.9268353
1988	9059999.860823149
1989	9199999.8241663
1990	9469999.98018146
1991	6490000.02257526
1992	4739999.98532236
1993	6830000.01125038
1994	8380000.041797761
1995	12889999.9763817
1996	23150000.0674278
1997	30500000.089407
1998	35180000.2623349
1999	38270000.2528727
2000	21530000.1669675
2001	22499999.8807907
2002	18860000.073909797
2003	24210000.0344217
2004	36519999.660551496
2005	29220000.1478195
2006	34399999.9165535
2007	33380000.2932549
2008	37759999.7520447
2009	38630000.4124641
2010	36299999.7138977
2011	25279999.554157298
2012	23362627.2827387
2013	24282350.1378298
2014	20073721.125721898
2015	18378853.574395202
2016	13946158.7965488
2017	12513175.200671
2018	8126188.635826111
2019	8820023.71549606
2020	9856173.47061634
2021	12843206.7036629
2022	17630248.87442588