Year	Percent
2000	99.82479
2001	99.8124
2002	99.8
2003	99.7876
2004	99.77521
2005	99.76281
2006	99.75041
2007	99.73801
2008	99.72562
2009	99.71322
2010	99.70082
2011	99.68842
2012	99.67603
2013	99.66363
2014	99.65123
2015	99.65123