Year	current US$
1970	1261650.7703595
1971	1927226.74772037
1972	1447406.29751703
1973	2233393.49593496
1974	2402743.14501936
1975	3182186.50793651
1976	2399454.71014493
1977	4741667.86899942
1978	6144749.53500202
1979	6439125.77542296
1980	7357821.34550963
1981	6625508.5011281
1982	12911998.078734
1983	9449436.07653836
1984	8862535.88442279
1985	4544159.96812338
1986	9560421.99903352
1987	9762466.58417332
1988	9730020.94464008
1989	10257731.6968604
1990	10371170.6789245
1991	11603708.3438521
1992	10537720.9922858
1993	10596398.1970029
1994	7589647.69090256
1995	12068386.9352566
1996	13397572.7214854
1997	14126308.9162562
1998	17994423.2292281
1999	15292729.350338
2000	9331017.98065179
2001	12494568.8035215
2002	12742340.6651767
2003	15578608.0854325
2004	13211011.7256836
2005	13173553.7183312
2006	16469445.1162287
2007	15872050.4115225
2008	28289337.4014751
2009	28203837.8565902
2010	34404747.564175
2011	37928482.2953058
2012	43621571.1033359
2013	38570120.8838318
2014	56366938.8120082
2015	50151874.4532514
2016	37781282.8105894
2017	49400590.3503247
2018	31626268.1715194
2019	40813910.2835478
2020	34588771.195943
2021	32773512.130653