Year	Number
1948	-3
1949	-3
1950	-3
1951	-3
1952	-4
1953	-4
1954	-4
1955	-4
1956	-4
1957	-4
1958	-4
1959	-4
1960	8
1961	-7
1962	-7
1963	3
1964	3
1965	3
1966	3
1967	3
1968	3
1969	3
1970	3
1971	3
1972	-9
1973	-8
1974	-8
1975	-8
1976	-8
1977	-8
1978	-8
1979	-8
1980	-8
1981	-5
1982	-5
1983	-5
1984	-5
1985	-5
1986	-5
1987	1
1988	6
1989	6
1990	6
1991	6
1992	6
1993	6
1994	6
1995	6
1996	6
1997	6
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