Year	Number
1956	8
1957	8
1958	-7
1959	-7
1960	-7
1961	-7
1962	-7
1963	-7
1964	0
1965	7
1966	7
1967	7
1968	7
1969	2
1970	-2
1971	-7
1972	-7
1973	-7
1974	-7
1975	-7
1976	-7
1977	-7
1978	-7
1979	-7
1980	-7
1981	-7
1982	-7
1983	-7
1984	-7
1985	0
1986	7
1987	7
1988	7
1989	-7
1990	-7
1991	-7
1992	-7
1993	-7
1994	-7
1995	-7
1996	-7
1997	-7
1998	-7
1999	-7
2000	-7
2001	-7
2002	-6
2003	-6
2004	-6
2005	-4
2006	-4
2007	-4
2008	-4
2009	-4
2010	-2
2011	-2