Year	current US$
1964	5680000
1965	3570000
1966	2730000
1967	2160000
1968	3060000
1969	5150000
1970	5220000
1971	6410858.26001939
1972	4528858.91169737
1973	5077616.86553787
1974	5957879.42687923
1975	6386826.34455623
1976	5240000
1977	9126441.37801424
1978	4782111.83205935
1979	4820000
1980	2770000
1981	3281639.54653682
1982	3481031.07454914
1983	7229251.95040491
1984	10557031.435465
1985	14020984.1827768
1986	23746325.3947867
1987	37198445.9986665
1988	49196954.6904227
1989	55066198.1233737
1990	69045292.0003983
1991	67807729.1908052
1992	57646263.1484868
1993	50705976.0725565
1994	50800685.1940794
1995	55312671.451166
1996	60804917.2888219
1997	64205877.1749924
1998	61422641.8056504
1999	68199386.610595
2000	63657900.5985558
2001	56635259.6655088
2002	62493668.5199687
2003	83909636.5316861
2004	86133747.2822373
2005	77256900.7477346
2006	75906873.4668761
2007	90264699.1001182
2008	81946109.9817463
2009	144476857.502779
2010	173039792.834034
2011	128020438.747896
2012	128350848.550635
2013	128930588.626755
2014	101674433.293393
2015	112244940.954544
2016	88868313.1645827
2017	123656063.041719
2018	162559147.904381
2019	177244065.937656
2020	277056415.241412
2021	294681800.100088
2022	321163283.656377
2023	447089817.094158