Year	current US$
1975	500000
1976	500000
1977	500000
1978	1400000
1979	200000
1980	-1900000
1981	3820000
1982	400000
1983	5500000
1984	3500000
1985	8800000
1986	3700000
1987	500000
1988	1400000
1989	300000
1990	300000
1998	1130000
1999	2000000
2000	770000
2001	24090000
2002	830000
2003	550000
2004	9600000
2005	930000
2006	93890000
2007	5790000
2008	13170000
2009	15660000
2010	9370000
2011	12170000
2012	11690000
2013	46600000
2014	40730000
2015	44240000
2016	71670000
2017	14190000
2018	87760000
2019	15090000
2020	12950000
2021	32080000
2022	6160000