Year	Percent
1998-01-01	49.500000000000000
1999-01-01	45.700000000000000
2000-01-01	55.800000000000000
2001-01-01	55.800000000000000
2002-01-01	55.800000000000000
2003-01-01	55.800000000000000
2004-01-01	55.800000000000000
2005-01-01	55.800000000000000
2006-01-01	55.800000000000000
2007-01-01	55.800000000000000
2008-01-01	55.800000000000000
2009-01-01	55.800000000000000
2010-01-01	55.800000000000000
2011-01-01	44.345500000000000
2012-01-01	43.858999999999995
2013-01-01	50.634900000000000
2014-01-01	54.657700000000000
2015-01-01	72.489100000000000
2016-01-01	79.634600000000000