Year	US Dollars
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	38504000
1993	277649000
1994	502493000
1995	695157000
1996	847656000
1997	1082410000
1998	1070923000
1999	1186611000
2000	1841763000
2001	1790543000
2002	1964799000
2003	2116535000
2004	2114079000
2005	2219300000
2006	2622104000
2007	3365276000
2008	3724454000
2009	3715120000
2010	4724733000
2011	5216930000
2012	5783056000
2013	6559760000
2014	6568711000
2015	6345427000
2016	6594690000