Year	Number
1966	9
1967	9
1968	9
1969	9
1970	-9
1971	-9
1972	-9
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	-7
1992	-7
1993	8
1994	8
1995	8
1996	8
1997	8
1998	0
1999	2
2000	4
2001	6
2002	8
2003	8
2004	8
2005	8
2006	8
2007	8
2008	8
2009	8
2010	8
2011	8