Year	Percent
1999-01-01	40.572900000000000
2000-01-01	37.553300000000000
2001-01-01	36.095500000000000
2002-01-01	32.456800000000000
2003-01-01	36.885900000000000
2004-01-01	41.431400000000000
2005-01-01	49.727500000000000
2006-01-01	61.730800000000000
2007-01-01	61.100700000000000
2008-01-01	36.209800000000000
2009-01-01	58.311300000000000
2010-01-01	61.696000000000005
2011-01-01	51.537200000000000
2012-01-01	61.529400000000000
2013-01-01	69.842800000000000
2014-01-01	65.086300000000000
2015-01-01	65.516600000000000
2016-01-01	68.836800000000000