Year	current US$
1969	8500000
1970	8100000
1973	13100000
1974	17400000
1975	7100000
1976	8199999.999999999
1977	22800000
1981	13663636.36
1982	9300000
1983	6443636.364
1984	7718181.818
1985	7410909.091
1986	7450909.091
1987	6861818.182
1988	13785659.23
1989	9812089.325000001
1990	29082737.5
1991	21118736.259999998
1992	5117390.528
1993	7754976.42
1994	8954562.845
1995	6528545.751
1996	7618344.949
1997	9245019.423
1998	16132351.889999999
1999	12429480.870000001
2000	4828205
2001	4778403
2002	8245830
2003	8156618.999999999
2004	4511426
2005	5229493
2006	6233211
2007	9201390
2008	12107926
2009	12678964
2010	15409547
2011	15202335
2012	10765609
2013	7881525
2014	11042677
2015	11088067
2016	1792094
2017	11695225
2018	13734962
2019	2736243
2020	3919858