Year	Percent
1995	4.693
1996	4.587
1997	4.312
1998	4.386
1999	4.587
2000	4.339
2001	4.687
2002	4.274
2003	4.631
2004	4.562
2005	4.734
2006	4.75
2007	4.6
2008	4.2
2009	4.3
2010	4.1