Year	US Dollars
1970	43207000
1971	51047000
1972	47314000
1973	90483000
1974	108806000
1975	119207000
1976	141218000
1977	212373000
1978	283897000
1979	453817000
1980	474870000
1981	543225000
1982	758278000
1983	798440000
1984	762602000
1985	902876000
1986	1038614000
1987	1244497000
1988	1170206000
1989	1070155000
1990	1119737000
1991	1149708000
1992	1198998000
1993	1270599000
1994	1382105000
1995	1396512000
1996	1377637000
1997	1411354000
1998	1433928000
1999	1488491000
2000	1399689000
2001	1470317000
2002	1608561000
2003	1485973000
2004	1612808000
2005	1551744000
2006	648365000
2007	883286000
2008	974330000
2009	1317169000
2010	1599164000
2011	1868559000
2012	2059616000
2013	2013609000
2014	2049873000
2015	2189758000
2016	2323370000