Year	Percent
1997-01-01	95.85450000000000
1998-01-01	94.47160000000000
1999-01-01	92.85910000000000
2000-01-01	95.06350000000000
2001-01-01	94.34920000000000
2002-01-01	90.29700000000001
2003-01-01	90.25980000000000
2004-01-01	92.95330000000000
2005-01-01	95.57090000000000
2006-01-01	97.02890000000000
2007-01-01	97.91240000000000
2008-01-01	98.70720000000000
2009-01-01	98.94550000000000
2010-01-01	99.40890000000000
2011-01-01	99.77320000000000
2012-01-01	99.81570000000000
2013-01-01	99.83590000000000
2014-01-01	99.84810000000000
2015-01-01	99.85440000000000