Year	Number
1959	-9
1960	-9
1961	-9
1962	-9
1963	-9
1964	-9
1965	-9
1966	-9
1967	-9
1968	-9
1969	-9
1970	-8
1971	-9
1972	-9
1973	-9
1974	-9
1975	-9
1976	-9
1977	-9
1978	-9
1979	-9
1980	-9
1981	-8
1982	-8
1983	-8
1984	-8
1985	-8
1986	-8
1987	-5
1988	-5
1989	-5
1990	-5
1991	-5
1992	-5
1993	-3
1994	-3
1995	-3
1996	-3
1997	-3
1998	-3
1999	-3
2000	-3
2001	-3
2002	-4
2003	-4
2004	-4
2005	-4
2006	-4
2007	-4
2008	-4
2009	-4
2010	-4