Year	current US$
1977	103699996.9
1978	120800003.1
1979	135699996.9
1980	65199996.949999996
1981	61700000.76
1982	75500000
1983	78099998.47
1984	74000000
1985	99000000
1986	100400001.5
1987	104400001.5
1988	102099998.5
1989	102099998.5
1990	109699996.9
1991	108099998.5
1992	102400001.5
1993	108699996.9
1994	112000000
1995	112000000
1996	86200000
1997	64300000
1998	58200000
1999	48300000
2000	16400000
2001	73100000
2002	84600000
2003	106800000
2004	108900000
2005	129600000
2006	300500000
2007	355300000
2008	378000000
2009	337000000
2010	410000000
2011	368200000
2012	410900000
2013	461400000
2014	756400000
2015	554200000
2016	502518500
2017	533355900
2018	537877175.61
2019	580854150.95
2020	386538182.81
2021	566699967.78
2022	526398352.72
2023	529964020.372844