Year	Total
1970	0
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	9000
1982	17000
1983	59000
1984	51000
1985	32000
1986	33000
1987	33000
1988	25000
1989	30000
1990	36000
1991	65000
1992	189000
1993	225000
1994	225000
1995	131000
1996	258000
1997	478000
1998	810000
1999	1170000
2000	1440000
2001	1800000
2002	2160000
2003	2136000
2004	3744000
2005	5796000
2006	6300000
2007	6372000
2008	6749100
2009	7209000
2010	8461800
2011	7632000
2012	8419500
2013	8775900
2014	9189000
2015	9594000
2016	9638800