Year	Percent
1995	4.027
1996	4.001
1997	4.504
1998	5.283
1999	6.224
2000	5.808
2001	5.425
2002	5.495
2003	6.277
2004	5.652
2005	7.204
2006	7.048
2007	7.718
2008	7.182
2009	7.85
2010	7.242