Year	US Dollars
1970	247327000
1971	270908000
1972	268461000
1973	301153000
1974	349030000
1975	356082000
1976	373792000
1977	471755000
1978	564050000
1979	567286000
1980	727064000
1981	830266000
1982	875178000
1983	988421000
1984	1237312000
1985	1456138000
1986	1743109000
1987	2049083000
1988	2019875000
1989	2127519000
1990	2468005000
1991	2599268000
1992	2900466000
1993	2903222000
1994	2694524000
1995	2958177000
1996	3006608000
1997	3152287000
1998	3204823000
1999	3217983000
2000	2981178000
2001	2878082000
2002	2792059000
2003	3076153000
2004	3289524000
2005	3195563000
2006	1603838000
2007	1850254000
2008	2055382000
2009	2210303000
2010	2455770000
2011	2921941000
2012	3059194000
2013	3445668000
2014	3456289000
2015	3688693000
2016	3787945000