Year	US Dollars
1970	2595000
1971	2637000
1972	5369000
1973	6286000
1974	8216000
1975	12234000
1976	17255000
1977	19237000
1978	21045000
1979	20524000
1980	25820000
1981	19836000
1982	24411000
1983	33566000
1984	62017000
1985	95976000
1986	119265000
1987	154397000
1988	158288000
1989	131250000
1990	155289000
1991	204847000
1992	219981000
1993	232492000
1994	257656000
1995	272438000
1996	287625000
1997	262660000
1998	279005000
1999	269330000
2000	297695000
2001	299614000
2002	358434000
2003	395028000
2004	459647000
2005	486492000
2006	566133000
2007	812247000
2008	846327000
2009	897022000
2010	778534000
2011	779098000
2012	811674000
2013	828276000
2014	949533000
2015	1233236000
2016	1706359000