Year	Percent
1995	2.44
1996	2.145
1997	3.19
1998	3.905
1999	3.524
2000	3.572
2001	3.669
2002	3.86
2003	3.692
2004	3.494
2005	3.269
2006	3.174
2007	3.772
2008	4.257
2009	4.854
2010	5.247