Year	Percent
1999-01-01	54.215400000000000
2000-01-01	43.126000000000005
2001-01-01	48.361600000000000
2002-01-01	47.871200000000000
2003-01-01	45.275400000000000
2004-01-01	40.554200000000000
2005-01-01	35.764200000000000
2006-01-01	31.437900000000000
2007-01-01	32.332500000000000
2008-01-01	31.052000000000000
2009-01-01	40.764600000000000
2010-01-01	36.813700000000000
2011-01-01	28.604400000000000
2012-01-01	27.526400000000000
2013-01-01	30.142700000000000
2014-01-01	32.408500000000000
2015-01-01	40.152200000000000
2016-01-01	44.725000000000000