Year	current US$
1960	176600000
1961	156130000
1962	145130000
1963	81130000
1964	19010000
1965	77800000
1966	65700000
1967	54600000
1968	64000000
1969	93000000
1970	119300000
1971	150660007.60291
1972	213650996.198525
1973	240597925.15061
1974	390957098.84661
1975	352385146.742508
1976	467083047.730459
1977	505337204.230039
1978	618402199.140679
1979	557036621.859858
1980	398612198.046849
1981	229676094.701301
1982	217584646.951104
1983	106680521.384788
1984	48686146.6988366
1985	115087873.462214
1986	211350971.82978
1987	411142490.317638
1988	547470993.527203
1989	488499382.342892
1990	2066493790.10115
1991	3100162740.1336
1992	3584034196.37824
1993	3654916972.39333
1994	4351696413.5033
1995	3601133295.04941
1996	3794028441.31418
1997	3992744580.81473
1998	4435029463.66241
1999	5689359141.57326
2000	4823173054.82376
2001	8473862876.9561
2002	10132656834.9756
2003	13851145172.1823
2004	16336624021.6054
2005	16187424949.2611
2006	20340718461.3579
2007	24123275214.4397
2008	22103775203.8162
2009	22797349592.7924
2010	22713297147.5582
2011	19082292656.0906
2012	15958824585.6826
2013	17944085607.4903
2014	19416547581.2067
2015	21996701264.8606
2016	24282138815.762
2017	25268147247.8717
2018	23549728686.8952
2019	25329860211.4799
2020	34653006798.9454
2021	34354119831.1337
2022	31025606470.8918
2023	34861268999.0963