Year	current US$
1970	16388799.3976798
1971	13611819.8748499
1972	15569160.9557539
1973	26549727.5180733
1974	29182576.3951545
1975	40869515.215918
1976	35792849.2835756
1977	68063292.8763839
1978	70590946.6440929
1979	64900715.0141487
1980	81796669.1320873
1981	73414706.7274238
1982	109563612.408745
1983	70806280.1054847
1984	66765235.7751693
1985	68187990.4712267
1986	102950758.586225
1987	105364584.925204
1988	112317909.701327
1989	118637523.118047
1990	151353797.187544
1991	148094366.053988
1992	151849120.38715
1993	133648599.086939
1994	157826086.10521
1995	237594960.70294
1996	243465074.101175
1997	229813314.110486
1998	241490064.640789
1999	124583235.118543
2000	131103342.206984
2001	164104571.443044
2002	199328809.20096
2003	317065510.356674
2004	277791225.871378
2005	296591135.165822
2006	300872214.742807
2007	434136029.676458
2008	526392198.613133
2009	535604619.40729
2010	480882869.686584
2011	550114143.066826
2012	399377646.643656
2013	429417624.908896
2014	465212966.527608
2015	477754639.379489
2016	499824344.338076
2017	494658478.124476
2018	357301496.973476
2019	338230904.721866
2020	366914712.027237
2021	387979513.505285