Year	current US$
1976	279087666.709229
1977	253059864.887693
1978	274885557.395828
1979	290782948.100523
1980	253532406.784179
1981	125035210.440616
1982	-3332914.18077242
1983	231330068.556347
1984	281731011.67388
1985	186912100.752709
1986	-113699831.456469
1987	-65964465.3642607
1988	-27450687.4957791
1989	79409733.3749982
1990	153242436.029961
1991	146378854.176458
1992	126300740.043557
1993	84413510.779666
1994	243306240.68473
1995	375608060.251764
1996	504193463.576477
1997	533460197.620153
1998	522269925.209524
1999	238384118.499536
2000	212595606.545427
2001	211986593.162597
2002	295135828.234283
2003	445486836.268919
2004	683357810.208069
2005	1014770585.42627
2006	1988472009.18337
2007	2575354289.227
2008	3470438836.15072
2009	2478045631.23382
2010	3209754136
2011	4314070690.80978
2012	4681269342.68506
2013	4845509048.99879
2014	4063116395.0732
2015	1657778839.47788
2016	1828553120.70294
2017	2268009460.5806
2018	2144746400.96139
2019	1175540269.66055
2020	268360870.628615
2021	682054278.448726