Year	current US$
1960	10000000
1961	6240000
1962	4470000
1963	9240000
1964	8130000
1965	8980000
1966	12100000
1967	5300000
1968	6120000
1969	8180000
1970	12530000
1971	26950866.9490591
1972	20802860.8667313
1973	21613158.2184247
1974	27638356.9291449
1975	86547903.8259791
1976	130918577.344226
1977	275820946.524611
1978	390555119.75129
1979	441211039.414711
1980	371168468.528784
1981	274293257.48599
1982	257752305.64221
1983	214163539.774343
1984	228707637.222427
1985	295206731.107206
1986	258523642.31282
1987	279676447.388954
1988	261124191.573253
1989	243694707.861329
1990	266400667.368511
1991	234894920.253472
2008	2430835946.06326
2009	3501370863.63846
2010	4174367357.95956
2011	5268341390.29608
2012	5982504170.91045
2013	6441933255.85729
2014	6680725917.17282
2015	6231780913.18054
2016	6476337158.7771
2017	7185835046.00596
2018	7305675819.84186
2019	7426979265.63529
2020	8419488003.81955