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	0
1997	0
1998	14.42
1999	15.14
2000	22.69
2001	24.07
2002	33.72
2003	28.18
2004	26.84
2005	46.09
2006	34.39
2007	24.74
2008	32.33
2009	28.89