Year	US Dollars
1971	119610000.61035
1972	1173869995.11719
1973	1948810058.59375
1974	2212969970.70313
1975	3968899902.34375
1976	1760239990.23438
1977	2576780029.29688
1978	2791530029.29688
1979	2875219970.70313
1980	2896669921.875
1981	2557260009.76563
1982	3226020019.53125
1983	2418520019.53125
1984	2782399902.34375
1985	2449629882.8125
1986	2592030029.29688
1987	2816659912.10938
1988	2226459960.9375
1989	2400699951.17188
1990	2659610107.42188
1991	2358969970.70313
1992	2070969970.70313
1993	1629829956.05469
1994	1862550048.82813
1995	1232329956.05469
1996	1205599975.58594
1997	1176589965.82031
1998	1350160034.17969
1999	1381260009.76563
2000	1363170043.94531
2001	1365900024.41406
2002	1150319946.28906
2003	1620770019.53125
2004	1637510009.76563
2005	1403660034.17969
2006	1114420043.94531
2007	1286630004.88281
2008	1698160034.17969
2009	1093199951.17188
2010	1327560058.59375
2011	1347010009.76563
2012	2030969970.70313
2013	2516909912.10938
2014	2324479980.46875
2015	2768080078.125
2016	2694820068.35938
2017	3998479980.46875
2018	3117429931.64063
2019	4507200195.3125
2020	5373870117.1875
2021	4927220214.84375