Year	Percent
1993	4.4
1996	4.5
1997	6.3
1998	6.2
1999	6.3
2000	6.4
2001	6.6
2002	6.6
2003	6.1
2004	6
2005	5.8
2006	5.9
2007	5.8
2008	6.1
2009	6.4
2010	6.4
2011	6.5
2012	6.3
2013	6.4
2014	6.6
2015	6.9