Year	US Dollars
1970	16048000
1971	9107000
1972	8930000
1973	8982000
1974	9276000
1975	10527000
1976	10643000
1977	14398000
1978	19120000
1979	22361000
1980	21536000
1981	34019000
1982	45420000
1983	58503000
1984	55599000
1985	59763000
1986	65314000
1987	80337000
1988	90750000
1989	91652000
1990	112886000
1991	124505000
1992	117301000
1993	149341000
1994	130258000
1995	128150000
1996	140693000
1997	116644000
1998	172157000
1999	137900000
2000	199420000
2001	235654000
2002	372085000
2003	369077000
2004	429595000
2005	408439000
2006	498587000
2007	533683000
2008	584886000
2009	602542000
2010	606245000
2011	578035000
2012	636323000
2013	612518000
2014	663733000
2015	685793000
2016	1296661000