Year	Number
1954	0
1955	2
1956	4
1957	6
1958	8
1959	8
1960	-1
1961	0
1962	0
1963	0
1964	0
1965	0
1966	0
1967	0
1968	0
1969	0
1970	0
1971	0
1972	0
1973	-2
1974	-5
1975	-7
1976	-7
1977	-7
1978	-7
1979	-7
1980	-7
1981	-7
1982	-7
1983	-7
1984	-7
1985	-7
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	-7
2003	-7
2004	-7
2005	-7
2006	-7
2007	-7
2008	-7
2009	-7
2010	-7
2011	-7