Year	current US$
1970	4883418.32813079
1971	4858623.01385989
1972	5279993.31606113
1973	5687936.10339209
1974	4726861.96271187
1975	2650757.39548872
1976	1739389.91515152
1977	2093101.75861292
1978	2471863.98239322
1979	2282022.14883359
1980	3020703.40095416
1981	2670822.9928974
1982	2925367.8840153
1983	2441278.99539929
1984	2345302.80352438
1985	947809.249781335
1986	999475.75824573
1987	1167969.36674871
1988	1863866.11371567
1989	1787285.98778331
1990	3720617.43125106
1991	3065693.56655701
1992	2634499.62517818
1993	3300241.2247906
1994	2685251.25609164
1995	3222420.13078999
1996	2890696.3848696
1997	2576722.5116367
1998	671063.207039573
1999	687483.968156895
2000	528704.659318403
2001	559417.887063375
2002	712945.696603604
2003	631473.473420379
2004	572371.474836862
2005	615079.463479505
2006	752565.534393076
2007	835044.247712982
2008	927875.509757512
2009	860983.910638258
2010	1544124.04355448
2011	1346143.86601895
2012	1324010.3939682
2013	1660535.17018052
2014	1983834.97926736
2015	1691853.67884978
2016	2062729.09222294
2017	2125075.99128678
2018	1674340.51510972
2019	1608194.96095832
2020	1862558.62569555
2021	1653717.52869648