Year	Percent
1995	5.094
1996	5.006
1997	4.857
1998	4.944
1999	4.884
2000	5.279
2001	5.586
2002	5.141
2003	5.226
2004	5.535
2005	5.856
2006	6.441
2007	6.99
2008	6.613
2009	6.895
2010	6.841