Year	current US$
1981	497652288.565336
1982	550978510.00405
1983	589400280.654301
1984	455495327.915346
1985	488812944.848007
1986	647914588.592527
1987	678127997.793535
1988	705577822.611971
1989	756358640.003417
1990	595050179.294153
1991	250037672.548961
1992	99045668.167684
1993	37257214.3416795
1994	62476875.9557827
1995	83389970.0782006
1996	66575111.7314393
1997	87360689.9417174
1998	108262539.621978
1999	95093351.927909
2000	110414871.393818
2001	150405427.119023
2002	149300011.176661
2003	157709831.962394
2004	159788334.067594
2005	203471569.630275
2006	256619578.993719
2007	279422914.061453
2008	368509188.940876
2009	363058885.565199
2010	505570692.592577
2011	630926758.64888
2012	800439954.345306
2013	791128634.001215
2014	939276163.498527
2015	1501421352.15407
2016	1572016624.98587
2017	1499628543.77604
2018	1485056174.16838
2019	1547674586.76446
2020	1611982354.48207
2021	1762700543.28985