Year	Number
1962	-8
1963	-8
1964	-8
1965	-9
1966	-9
1967	-9
1968	-9
1969	-9
1970	-9
1971	-9
1972	-9
1973	-9
1974	-9
1975	-9
1976	-9
1977	-9
1978	-9
1979	-9
1980	-9
1981	-9
1982	-9
1983	-9
1984	-9
1985	-9
1986	-9
1987	-9
1988	-9
1989	-2
1990	-2
1991	-2
1992	-7
1993	-7
1994	-7
1995	-3
1996	-3
1997	-3
1998	-3
1999	-3
2000	-3
2001	-3
2002	-3
2003	-3
2004	2
2005	2
2006	2
2007	2
2008	2
2009	2
2010	2
2011	2