Year	Percent
1995	4.231
1996	3.616
1997	3.904
1998	3.78
1999	3.651
2000	3.959
2001	4.486
2002	4.363
2003	4.524
2004	4.381
2005	4.432
2006	4.393
2007	4.79
2008	4.822
2009	5.464
2010	5.199