Year	current US$
1976	9000000
1977	8000000
1978	9000000
1979	19000000
1980	9000000
1981	6000000
1982	2000000
1983	13000000
1984	16000000
1985	47000000
1986	30000000
1987	55000000
1988	60000000
1989	34000000
1990	62000000
1991	60000000
1992	52000000
1993	61000000
1994	73000000
1995	96000000
1996	45000000
1997	71000000
1998	70449996.9482422
1999	70589996.3378906
2000	115519996.64306599
2001	91839996.3378906
2002	159679992.67578098
2003	135399993.89648402
2004	109959999.084473
2005	85360000.6103516
2006	108849998.47412099
2007	153380004.882813
2008	226660003.66210902
2009	255610000.61035198
2010	267489990.234375
2011	377519989.013672
2012	412559997.558594
2013	541169982.910156
2014	395380004.88281304
2015	301559997.558594
2016	389410003.66210896
2017	503529998.779297
2018	519640014.648438
2019	352070007.324219
2020	483140014.64843804
2021	573859985.351563
2022	527950012.207031