Year	Percent
1995	3.619
1996	3.524
1997	3.524
1998	3.571
1999	3.443
2000	3.719
2001	3.801
2002	4.171
2003	3.891
2004	4.166
2005	4.5
2006	4.279
2007	5.183
2008	5.261
2009	5.594
2010	5.998