Year	current US$
1968	54710000.127553895
1969	58060000.0247359
1970	69069999.4601309
1971	80709999.8034537
1972	70310000.1793355
1973	87049999.7418374
1974	75910000.14171
1975	110770000.660792
1976	104990000.77135901
1977	97639999.0618229
1978	124809999.592602
1979	171950000.941753
1980	193509998.67916098
1981	285590001.91092503
1982	242690001.219511
1983	214770000.487566
1984	228969999.43256402
1985	253470000.743866
1986	293119999.110699
1987	298699999.45163697
1988	367339999.79496
1989	405910000.801086
1990	307219999.909401
1991	354560002.32324
1992	295120002.68697697
1993	239609998.613596
1994	187729999.620467
1995	174010001.577437
1996	228169997.05135798
1997	293239999.637008
1998	247410000.86814198
1999	209280000.507832
2000	165789999.566972
2001	126490000.993013
2002	131759999.26403199
2003	154199999.760836
2004	186349999.83757702
2005	196400001.324713
2006	228829999.96841
2007	222389998.942614
2008	285480000.85353905
2009	287139998.57381
2010	270680000.87142
2011	215269999.802113
2012	218813235.402107
2013	210117233.037949
2014	234271715.164185
2015	229493495.732546
2016	217715682.446957
2017	204332434.127107
2018	229641288.347542
2019	252222706.437111
2020	293030618.816614
2021	281781057.417393
2022	271269491.9109344