Year	current US$
1977	585085785.92416
1978	767030531.28811
1979	754791097.009145
1980	638776968.731024
1981	558630924.143999
1982	1112273963.08307
1983	989415976.71777
1984	249302517.84059
1985	496805496.11464
1986	405074797.862857
1987	1098559921.85875
1988	470042954.34079
1989	-331774257.766866
1990	520478290.270043
1991	257589929.266534
1992	856970879.146573
1993	1080159787.12123
1994	1445325377.67843
1995	1383752925.51803
1996	1751278768.71045
1997	1933667289.42483
1998	1483800703.71278
1999	1259511070.20679
2000	1712030947.17095
2001	1433634180.31929
2002	1387120579.79857
2003	1401083101.73198
2004	1160328575.41275
2005	1694964840.98819
2006	2273121542.03186
2007	4156251143.57557
2008	5537458403.93854
2009	5905637561.4031
2010	4971624231.31566
2011	7600782421.69457
2012	9820522727.90738
2013	11439012024.2014
2014	11024406487.5277
2015	13887788069.3445
2016	13530489551.31
2017	15499260931.5409
2018	14126434394.2527
2019	13466329997.4671
2020	8747586137.20905
2021	11211573748.721