Year	Percent
1995	4.588
1996	4.66
1997	4.562
1998	4.659
1999	4.705
2000	4.727
2001	5.31
2002	5.115
2003	5.597
2004	6.234
2005	6.274
2006	6.775
2007	6.56
2008	6.814
2009	7.367
2010	7.653