Year	Number
1993	-6
1994	-6
1995	-6
1996	-6
1997	-6
1998	-6
1999	-6
2000	-6
2001	-7
2002	-7
2003	-7
2004	-7
2005	-7
2006	-7
2007	-7
2008	-7
2009	-7
2010	-7
2011	-7