Year	Percent
1995	3.583
1996	3.497
1997	3.62
1998	3.606
1999	3.698
2000	3.557
2001	3.395
2002	3.086
2003	2.914
2004	2.964
2005	3.403
2006	3.431
2007	3.427
2008	3.616
2009	3.746
2010	3.563