Year	US Dollars
1960	77750000
1961	76709999.08447
1962	96480003.35693
1963	80339996.33789
1964	64629997.25342
1965	105040000.91553
1966	230039993.28613
1967	320600006.10352
1968	357209991.45508
1969	329720001.2207
1970	326739990.23438
1971	333450012.20703
1972	296769989.01367
1973	255690002.44141
1974	313399993.89648
1975	525979980.46875
1976	572059997.55859
1977	569630004.88281
1978	839719970.70312
1979	777169982.91016
1980	882830017.08984
1981	868919982.91016
1982	963760009.76562
1983	1083319946.28906
1984	1071699951.17188
1985	1089380004.88281
1986	1002789978.02734
1987	730039978.02734
1988	874369995.11719
1989	841780029.29688
1990	904739990.23438
1991	1016429992.67578
1992	692179992.67578
1993	729679992.67578
1994	610369995.11719
1995	481299987.79297
1996	390869995.11719
1997	305970001.2207
1998	400880004.88281
1999	205229995.72754
2000	250240005.49316
2001	332920013.42773
2002	329179992.67578
2003	631830017.08984
2004	442290008.54492
2005	1141989990.23438
2006	745609985.35156
2007	507420013.42773
2008	609369995.11719
2009	598090026.85547
2010	525849975.58594
2011	535650024.41406
2012	431130004.88281
2013	382950012.20703
2014	470079986.57227
2015	472649993.89648
2016	397510009.76562
2017	329149993.89648
2018	-251839996.33789
2019	195800003.05176
2020	217960006.71387
2021	140690002.44141