Year	current US$
1970	296847041.405889
1971	383662746.224008
1972	378952055.805785
1973	416206165.143843
1974	1031798038.23931
1975	2232935738.45654
1976	2565537299.49394
1977	2482513480.00049
1978	2328183421.5536
1979	2718429573.66599
1980	3135816432.66231
1981	3896801267.75621
1982	3783178405.78316
1983	2817067867.89398
1984	2297182590.55698
1985	2205589985.49802
1986	1531507180.38695
1987	1048548153.20324
1988	911445484.037355
1989	1228913954.82219
1990	1736936179.60292
1991	1378318505.45717
1992	1128406013.10375
1993	920007997.534568
1994	633372180.366952
1995	961859525.185602
1996	1013187445.38378
1997	929938545.003205
1998	413600621.336857
1999	352885079.326628
2000	850205292.387864
2001	1332125469.96012
2002	1154964535.34177
2003	1232380972.44806
2004	1601612704.53127
2005	1959073103.34484
2006	2609482694.92279
2007	2473794052.6895
2008	5236626051.15533
2009	2775966572.75336
2010	2638359298.8901
2011	3786281014.43294
2012	2844935552.00978
2013	2279901632.64086
2014	1577037508.74686
2015	936770680.81791
2016	659595772.05639
2017	890300205.870526
2018	1144529960.21771
2019	784734777.504774
2020	403177903.142091
2021	1303395270.46929