Year	Number
1944	5
1945	5
1946	5
1947	5
1948	5
1949	-7
1950	2
1951	-7
1952	-7
1953	-7
1954	7
1955	7
1956	7
1957	7
1958	-7
1959	-7
1960	-7
1961	-2
1962	-2
1963	-7
1964	-7
1965	-7
1966	-7
1967	-7
1968	-7
1969	-7
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	-9
1990	-9
1991	-9
1992	-9
1993	-9
1994	-9
1995	-9
1996	-9
1997	-9
1998	-9
1999	-9
2000	-7
2001	-7
2002	-7
2003	-7
2004	-7
2005	-7
2006	-7
2007	-7
2008	-7
2009	-7
2010	-7
2011	-7