Year	current US$
1974	314979636.153356
1975	115310481.750948
1976	164372522.30554
1977	173086753.252913
1978	310357372.394373
1979	204945658.761859
1980	227898977.893419
1981	105442738.835687
1982	57772835.442132
1983	93761165.0690097
1984	56005295.6795082
1985	32875940.689919
1986	58358140.03017
1987	59310642.7374299
1988	87734872.8131765
1989	89541396.3742592
1990	248842253.495207
1991	119872873.231392
1992	67742523.8348818
1993	-60681503.5922429
1994	82433902.0161699
1995	149765390.656044
1996	119472664.944564
1997	32055127.9194817
1998	48886047.8363814
1999	31521075.0438388
2000	147561130.046987
2001	123855516.538092
2002	217892784.643765
2003	301494052.463466
2004	314485392.137603
2005	202623188.787027
2006	267008388.929352
2007	193962263.667035
2008	273814152.245163
2009	339280085.16115
2010	274392533.36798
2011	313359613.522091
2012	209642434.401615
2013	315725372.520524
2014	431219358.592927
2015	580617853.442674
2016	463956311.192608
2017	657792422.322542
2018	647236884.138707
2019	979062893.875169
2020	1243232806.59505