Year	Percent
1998-01-01	39.33720000000000
1999-01-01	42.46860000000000
2000-01-01	45.80000000000000
2001-01-01	45.80000000000000
2002-01-01	42.50700000000000
2003-01-01	45.83660000000000
2004-01-01	44.51130000000000
2005-01-01	46.82520000000000
2006-01-01	46.54600000000001
2007-01-01	51.58810000000000
2008-01-01	48.66270000000000
2009-01-01	51.64080000000000
2010-01-01	59.40980000000000
2011-01-01	55.70690000000000
2012-01-01	56.27410000000000
2013-01-01	56.62900000000000
2014-01-01	54.75610000000000
2015-01-01	51.29970000000000
2016-01-01	52.48870000000000