Year	current US$
1981	191740891499.887
1982	163664746980.677
1983	102956601625.866
1984	66669347177.3568
1985	56073288953.1554
1986	53009277346.87
1987	49318011663.878
1988	45026575658.8894
1989	46332798544.2005
1990	52405944436.4604
1991	48022717968.7077
1992	44413995319.2717
1993	32903961519.8772
1994	35459537292.4635
1995	39812728899.4707
1996	43362997518.9697
1997	44202565047.8333
1998	45387661636.3541
1999	43720276651.928
2000	47620545381.439
2001	46401225279.3904
2002	48571570004.4738
2003	57053102981.2758
2004	67744074651.1092
2005	84409368128.5133
2006	114414204794.147
2007	114157739095.454
2008	134535294321.995
2009	128190472695.709
2010	128338229296.948
2011	145497936631.353
2012	155874461334.5
2013	168150370416.879
2014	188773259578.518
2015	177180920910.165
2016	162212038735.393
2017	163012283329.059