Year	Number
1960	-7
1961	-7
1962	-7
1963	-7
1964	-7
1965	-7
1966	-7
1967	-7
1968	-7
1969	-7
1970	-7
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	-7
1986	-7
1987	-7
1988	-7
1989	-7
1990	-7
1991	0
1992	7
1993	7
1994	7
1995	7
1996	7
1997	6
1998	6
1999	6
2000	6
2001	6
2002	7
2003	7
2004	7
2005	7
2006	7
2007	7
2008	7
2009	7
2010	7
2011	7