Year	Percent
1995	3.752
1996	3.922
1997	3.923
1998	4.052
1999	4.265
2000	4.481
2001	5.057
2002	4.915
2003	5.181
2004	5.251
2005	5.665
2006	6.047
2007	6.302
2008	6.458
2009	6.921
2010	6.932