Year	current US$
1968	219999999.99913
1969	253999999.99889803
1970	302999999.99844
1971	345025119.996803
1972	344170070
1973	407708459.999111
1974	533972159.994537
1975	567258300
1976	616323759.999481
1977	743239199.999207
1978	821911999.998688
1979	913932000
1980	1134477909.99976
1981	1258062720
1982	1291072679.99976
1983	1214000000
1984	1236000000
1985	1375000000
1986	1625000000
1987	1646000000
1988	1615000000
1989	1510000000
1990	1683000000
1991	1750000000
1992	1959000000
1993	2246400000
1994	2559906185.28642
1995	2799611834.67644
1996	3324879698.79247
1997	3626798613.43218
1998	3351796483.18412
1999	3079702977.20984
2000	3370014304.76996
2001	3737398179.64823
2002	3478436478.23345
2003	3503264417.54577
2004	4212109597.09596
2005	5195399075.61543
2006	5935355455.37561
2007	7379675035.67515
2008	8652934698.41479
2009	8662929561.72371
2010	10538320916.4287
2011	12044883234.831
2012	13836605530.9042
2013	14594927221.0678
2014	16093058205.8177
2015	13835704048.1277
2016	12838646578.6979
2017	13873083122.4247
2018	14760841222.4192
2019	14840238502.8519
2020	10042068793.5875
2021	14078531936.433718
2022	17881904859.799076
2023	16472014468.180416