Year	Total
1971	0
1972	0
1973	0
1974	0
1975	0
1976	0
1977	0
1978	0
1979	0
1980	0
1981	0
1982	0
1983	0
1984	0
1985	0
1986	0
1987	0
1988	0
1989	0
1990	0
1991	0
1992	0
1993	0
1994	0
1995	0
1996	119200
1997	464300
1998	456300
1999	446900
2000	469100
2001	468300
2002	474000
2003	421800
2004	477000
2005	477600
2006	484300
2007	662900
2008	965300
2009	1010000
2010	999400