Year	current US$
1977	2521379530.84952
1978	3099755219.49567
1979	3381668622.66742
1980	3714056890.14217
1981	3938397339.53466
1982	4740011344.85246
1983	7119573953.22293
1984	7661069547.7202
1985	6894088070.34088
1986	6208476758.85682
1987	8357737972.83179
1988	7494670129.42868
1989	8093707567.27486
1990	11060139119.5972
1991	10838068734.8175
1992	12268918318.1454
1993	11865048290.7291
1994	9119021836.90828
1995	9503471780.57927
1996	8345697832.27743
1997	9058722686.31385
1998	10884047114.3136
1999	10904461659.1351
2000	11360503533.219
2001	13151993515.8702
2002	11239424234.3472
2003	10812397460.9045
2004	12179416220.0991
2005	14414864781.0831
2006	18578133601.3402
2007	22748916171.3266
2008	28226798739.3236
2009	19284384064.8221
2010	25347321808.0644
2011	25864219317.6006
2012	22218764915.2758
2013	24798281883.8904
2014	20431861406.9614
2015	14865757869.0479
2016	12518707575.6885
2017	10290121164.0438
2018	20850465586.9262
2019	28036704305.9785
2020	18970748800.1632
2021	7146435991.58806