Year	Percent
1995	4.458
1996	4.446
1997	4.728
1998	4.168
1999	4.153
2000	3.722
2001	3.64
2002	3.926
2003	3.901
2004	3.719
2005	3.655
2006	3.882
2007	3.917
2008	4.629
2009	4.601
2010	4.471