Year	Percent
1998-01-01	43.056000000000004
1999-01-01	42.005400000000000
2000-01-01	44.300000000000000
2001-01-01	40.800000000000000
2002-01-01	33.786400000000000
2003-01-01	27.212000000000000
2004-01-01	45.382900000000000
2005-01-01	37.759800000000000
2006-01-01	38.473100000000000
2007-01-01	38.695400000000000
2008-01-01	38.823000000000000
2009-01-01	34.206300000000000
2010-01-01	35.703300000000000
2011-01-01	38.396200000000000
2012-01-01	41.065700000000000
2013-01-01	29.009500000000000
2014-01-01	42.661100000000000
2015-01-01	42.000500000000000
2016-01-01	44.076200000000000