Year	current US$
1976	27254188.7639003
1977	32830354.3050868
1978	44333392.8252723
1979	57328197.079945
1980	47670835.3395885
1981	50455099.8713141
1982	47499839.0434583
1983	46149220.0714151
1984	41798221.7777875
1985	39170082.5643518
1986	47898027.6837165
1987	55183954.2793248
1988	62711624.757213
1989	73512308.3581423
1990	81550846.0322266
1991	91602455.8691056
1992	114409785.091129
1993	115528209.094714
1994	133127272.808125
1995	148786266.226857
1996	153229433.89551
1997	145939553.171584
1998	159840795.612058
1999	156210237.164196
2000	158451301.982506
2001	133261119.161806
2002	147334893.868566
2003	184595691.756357
2004	247487753.41455
2005	229414929.073575
2006	236530933.736175
2007	249609241.322488
2008	315977197.323289
2009	295398985.600663
2010	342164557.373215
2011	373060161.63868
2012	379350628.951747
2013	434902480.017197
2014	626712849.753116
2015	576539922.468459
2016	597443442.809756
2017	661132784.631716
2018	712534071.620536
2019	704642496.511478
2020	554329792.181848
2021	558095068.370268