Year	Percent
1998-01-01	49.526700000000000
1999-01-01	46.992800000000000
2000-01-01	54.958600000000000
2001-01-01	58.260400000000000
2002-01-01	56.126000000000005
2003-01-01	60.928000000000004
2004-01-01	71.544200000000000
2005-01-01	78.669000000000000
2006-01-01	83.075900000000000
2007-01-01	90.961800000000000
2008-01-01	92.575400000000000
2009-01-01	89.880500000000000
2010-01-01	90.378400000000000
2011-01-01	91.888400000000000
2012-01-01	82.547999999999990
2013-01-01	77.321200000000000
2014-01-01	81.234900000000000
2015-01-01	83.509600000000000
2016-01-01	74.772700000000000