Year	Percent
1993	99
1994	99.5
1995	99.5
1996	99.6
1997	99.4
1998	99.6
1999	99.4
2000	99
2001	99.8
2002	99.8
2003	97.7
2004	99.8
2005	99.8
2006	99.8
2007	99.7
2008	99.8
2009	99.8
2010	99.8
2011	99.8
2012	99.8
2013	99.8
2014	99.8
2015	99.7