Year	US Dollars
1970	35191000
1971	46990000
1972	36534000
1973	47950000
1974	76030000
1975	143033000
1976	155883000
1977	206654000
1978	280957000
1979	308434000
1980	284236000
1981	259157000
1982	220538000
1983	219449000
1984	193968000
1985	216487000
1986	263175000
1987	347956000
1988	395718000
1989	398672000
1990	514179000
1991	616561000
1992	641680000
1993	692277000
1994	784044000
1995	841874000
1996	946590000
1997	956913000
1998	1029975000
1999	1109216000
2000	1098901000
2001	1095688000
2002	1276028000
2003	1539455000
2004	1652256000
2005	1629648000
2006	1757294000
2007	1848762000
2008	1802461000
2009	1874374000
2010	2157557000
2011	2346186000
2012	2361262000
2013	2924996000
2014	2395640000
2015	1617003000
2016	1654990000