Year	US Dollars
1970	52164000
1971	50037000
1972	53696000
1973	51307000
1974	120420000
1975	148427000
1976	181456000
1977	235043000
1978	281813000
1979	334668000
1980	382656000
1981	500090000
1982	609873000
1983	644477000
1984	731571000
1985	782786000
1986	773999000
1987	905281000
1988	877118000
1989	859314000
1990	939003000
1991	804897000
1992	830300000
1993	845831000
1994	758204000
1995	837403000
1996	924239000
1997	1071797000
1998	1068534000
1999	1221741000
2000	1203393000
2001	1285546000
2002	1280699000
2003	1364913000
2004	1331165000
2005	1346849000
2006	1524873000
2007	1601446000
2008	1964205000
2009	1448333000
2010	956799000
2011	770826000
2012	1155569000
2013	1558883000
2014	1940074000
2015	2084271000
2016	2158090000