Year	US Dollars
1960	229000000
1961	350609985.35156
1962	212809997.55859
1963	257140014.64844
1964	311899993.89648
1965	453890014.64844
1966	457589996.33789
1967	476600006.10352
1968	376829986.57227
1969	396709991.45508
1970	395579986.57227
1971	386329986.57227
1972	337369995.11719
1973	339609985.35156
1974	247770004.27246
1975	135160003.66211
1976	98639999.38965
1977	95110000.61035
1978	186929992.67578
1979	124279998.7793
1980	97739997.86377
1981	95980003.35693
1982	96169998.16895
1983	77980003.35693
1984	84150001.52588
1985	87610000.61035
1986	81699996.94824
1987	90400001.52588
1988	107690002.44141
1989	169880004.88281
1990	151380004.88281
1991	150179992.67578
1992	189830001.83105
1993	206559997.55859
1994	236679992.67578
1995	266589996.33789
1996	296929992.67578
1997	311929992.67578
1998	279489990.23438
1999	302250000
2000	297720001.2207
2001	294100006.10352
2002	322299987.79297
2003	309750000
2004	260279998.7793
2005	272019989.01367
2006	338320007.32422
2007	356019989.01367
2008	446079986.57227
2009	370850006.10352
2010	373010009.76562
2011	334100006.10352
2012	374950012.20703
2013	399269989.01367
2014	454619995.11719
2015	505309997.55859
2016	423720001.2207
2017	499859985.35156
2018	590270019.53125
2019	636840026.85547
2020	529080017.08984
2021	539500000