Year	current US$
1968	3200000.04768372
1969	2680000.0667572
1970	4050000.1907348596
1971	4440000.05722046
1972	4500000
1973	6679999.82833862
1974	7969999.79019165
1975	11619999.8855591
1976	8420000.07629395
1977	7639999.8664856
1978	12449999.8092651
1979	10899999.6185303
1980	13010000.2288818
1981	15300000.1907349
1982	17780000.6866455
1983	16870000.8392334
1984	16290000.9155273
1985	14260000.2288818
1986	15630000.1144409
1987	21149999.6185303
1988	20590000.1525879
1989	19079999.9237061
1990	11579999.923706101
1991	13680000.3051758
1992	12579999.923706101
1993	11479999.5422363
1994	11659999.8474121
1995	10380000.1144409
1996	8859999.65667725
1997	8090000.152587891
1998	4929999.82833862
1999	4130000.11444092
2000	3150000.09536743
2001	3819999.9332428
2002	4110000.1335143996
2003	5889999.8664856
2004	7840000.15258789
2005	8149999.61853027
2006	9600000.38146973
2007	8039999.961853029
2008	5800000.19073486
2009	4300000.19073486
2010	5519999.98092651
2011	4710000.03814697
2012	3306980.37147522
2013	3134198.9040374802
2014	2588142.15660095
2015	2065256.11877441
2016	1235155.10559082
2017	1280017.73357391
2018	561711.192131042
2019	1352290.03429413
2020	981008.112430573
2021	602999.746799469
2022	1277367.59185791