Year	Percent
1995	3.503
1996	3.651
1997	3.404
1998	3.809
1999	4.094
2000	3.984
2001	4.536
2002	4.468
2003	3.935
2004	4.4
2005	3.861
2006	3.446
2007	3.245
2008	3.261
2009	3.692
2010	3.575