Year	current US$
1976	151771618.0934442
1977	162587695.9744041
1978	190028748.3240317
1979	215340655.69526258
1980	270898907.5972606
1981	314185313.0134783
1982	327515271.8059664
1983	314432384.67968637
1984	338605669.4023993
1985	274900877.97705114
1986	286504157.5281039
1987	360978769.138913
1988	416978592.8687471
1989	389921299.0111977
1990	393216378.18929636
1991	543259167.768273
1992	685847179.343414
1993	804594449.759264
1994	608036984.504161
1995	642145009.43203
1996	778541443.767967
1997	923551202.838307
1998	793815330.743643
1999	727858223.709793
2000	772274718.711703
2001	662000555.083815
2002	754937425.554214
2003	862245783.3646547
2004	967961385.9509324
2005	1151405599.579369
2006	1467143351.6174157
2007	1806985969.6210973
2008	1725001149.5154724
2009	1830122972.9048104
2010	2738276421.6570206
2011	2950279148.2529917
2012	3714141444.3741126
2013	3866284565.6393385
2014	2261458142.264043
2015	1956382390.6589298
2016	1471646537.0455344
2017	1976062781.407926
2018	2173309862.5805793
2019	2093350218.2696204
2020	1691226016.021139
2021	2008935663.655