Year	Percent
1995	4.575
1996	4.55
1997	4.654
1998	4.705
1999	4.666
2000	3.949
2001	4.258
2002	4.387
2003	4.246
2004	3.949
2005	3.706
2006	3.545
2007	3.635
2008	4.221
2009	4.665
2010	4.972