Year	current US$
1977	2835958.74178828
1978	3236276.086268
1979	4109698.5221442
1980	5146829.77372624
1981	6720648.94331719
1982	8279654.47232129
1983	9611664.11654376
1984	10742871.9619329
1985	13054735.44403
1986	15532270.5267206
1987	16107999.6540171
1988	18804974.018942
1989	19980229.623566
1990	21482585.1231656
1991	23423428.9899576
1992	22210040.0354969
1993	24970928.155717
1994	25172629.8969237
1995	27098121.1798894
1996	26990974.8672948
1997	33537182.379149
1998	39833737.9832359
1999	47698936.5750247
2000	55917425.228112
2001	72451458.6968508
2002	72510814.3607453
2003	97559038.9807916
2004	85015319.7276885
2005	97041824.208974
2006	113141825.644572
2007	129221558.924268
2008	156748717.555037
2009	173765761.471303
2010	183201097.62777
2011	189016668.999528
2012	193202429.67549
2013	183535411.379644
2014	173885208.776464
2015	175006919.491573
2016	170002057.904085
2017	169610260.037342
2018	166465668.699238
2019	173347837.006274
2020	143042931.823619
2021	147459500.531807