Year	US Dollars
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	326000
1982	1144000
1983	1764000
1984	2733000
1985	8832000
1986	20952000
1987	40242000
1988	67083000
1989	73856000
1990	83544000
1991	86340000
1992	89199000
1993	96620000
1994	104510000
1995	105770000
1996	113041000
1997	119620000
1998	171041000
1999	192034000
2000	211575000
2001	272714000
2002	386050000
2003	493625000
2004	601317000
2005	656602000
2006	721114000
2007	801239000
2008	693077000
2009	786648000
2010	934630000
2011	1071602000
2012	1449648000
2013	1603151000
2014	1836095000
2015	2013104000
2016	2348179000