Year	current US$
1971	5400000.095
1972	3279988.05
1973	7940000.057
1974	97286626.11400001
1975	201596158.033
1976	214153203.84570003
1977	242402538.58900002
1978	351199919.56600004
1979	500150818.7405001
1980	598328819.2840999
1981	540791514.5743
1982	537817331.1766
1983	546323056.2572
1984	492264832.5998
1985	577903039.3222998
1986	754470741.4796
1987	720719944.5936
1988	636819641.3037997
1989	657082767.2279
1990	799654049.2217355
1991	800301807.6361797
1992	779621696.0637964
1993	736510470.0696791
1994	641771866.7162113
1995	715650986.5114218
1996	681856512.4892851
1997	695623427.6333426
1998	718946243.7520423
1999	1038420462.2900214
2000	1251758384.8310728
2001	1135227221.786743
2002	1162647607.480067
2003	1128966197.1856272
2004	1338921013.381363
2005	1459137583.6570225
2006	1756679256.2519999
2007	2262511203.8237505
2008	2897811865.5688767
2009	3618203636.103201
2010	4369779940.304419
2011	4882409544.08594
2012	6642587212.716614
2013	7931938326.973525
2014	8026450642.792658
2015	6486487887.538413
2016	5910915813.14766
2017	5671542722.306333
2018	6402549108.1127825
2019	6057177972.921555
2020	6011642732.043304
2021	5411841356.768788
2022	4986443178.1138735