Year	Percent
1995	4.11
1996	4.004
1997	4.346
1998	4.409
1999	4.166
2000	4.409
2001	4.642
2002	4.54
2003	4.424
2004	4.153
2005	4.153
2006	4.048
2007	3.964
2008	4.008
2009	4.159
2010	4.054