Year	Percent
1995	3.1
1996	3.109
1997	3.636
1998	3.56
1999	3.877
2000	4.64
2001	4.585
2002	4.48
2003	4.459
2004	4.301
2005	4.837
2006	4.892
2007	5.347
2008	5.585
2009	5.928
2010	5.983