Year	Number
1971	-10
1972	-10
1973	-10
1974	-10
1975	-10
1976	-10
1977	-10
1978	-10
1979	-10
1980	-10
1981	-10
1982	-10
1983	-10
1984	-10
1985	-10
1986	-10
1987	-10
1988	-10
1989	-10
1990	-10
1991	-10
1992	-10
1993	-10
1994	-10
1995	-10
1996	-10
1997	-10
1998	-10
1999	-10
2000	-10
2001	-10
2002	-10
2003	-10
2004	-10
2005	-10
2006	-10
2007	-10
2008	-10
2009	-10
2010	-10
2011	-10