Year	Number
1935	5
1936	5
1937	5
1938	5
1939	5
1940	5
1941	-10
1942	-10
1943	-10
1944	2
1945	2
1946	2
1947	2
1948	2
1949	2
1950	5
1951	5
1952	5
1953	5
1954	5
1955	5
1956	5
1957	5
1958	5
1959	5
1960	5
1961	5
1962	5
1963	5
1964	5
1965	5
1966	5
1967	5
1968	5
1969	2
1970	2
1971	2
1972	-9
1973	-9
1974	-9
1975	-9
1976	-9
1977	-9
1978	-9
1979	-9
1980	-9
1981	-8
1982	-7
1983	-6
1984	-6
1985	-6
1986	1
1987	8
1988	8
1989	8
1990	8
1991	8
1992	8
1993	8
1994	8
1995	8
1996	8
1997	8
1998	8
1999	8
2000	8
2001	8
2002	8
2003	8
2004	8
2005	8
2006	8
2007	8
2008	8
2009	8
2010	8
2011	8