Year	Percent
1995	3.081
1996	3.239
1997	3.498
1998	3.169
1999	3.119
2000	3.848
2001	3.257
2002	3.458
2003	3.325
2004	3.577
2005	3.608
2006	3.837
2007	4.38
2008	4.234
2009	4.989
2010	4.857