Year	current US$
1973	7409000
1974	8294000.000000001
1975	12106000
1976	12747000
1977	13886000
1978	17099000
1979	21693000
1980	17903000
1981	19332000
1982	18840000
1983	18783000
1984	17723000
1985	21850000
1986	26431000
1987	29799000
1988	28518222.22
1989	25041851.85
1990	21318148.15
1991	27452286.77
1992	58329646.1
1993	22410635.19
1994	23338261.849999998
1995	21903217.779999997
1996	19670247.78
1997	25896436.67
1998	41989703.7
1999	69402740.74
2000	84266238
2001	62519541
2002	39903700
2003	41823589
2004	33370772.000000004
2005	29195342
2006	26548341
2007	35503658
2008	35811252
2009	36533647
2010	27950779
2011	36968980
2012	31022977
2013	31738239
2014	28158541
2015	25061573
2016	24113789
2017	21782691
2018	23526357
2019	19544455
2020	13678535