Year	Percent
1999-01-01	12.962700000000000
2000-01-01	7.204880000000000
2001-01-01	13.132400000000000
2002-01-01	12.424200000000000
2003-01-01	17.157200000000000
2004-01-01	20.449800000000000
2005-01-01	27.776999999999997
2006-01-01	27.316500000000000
2007-01-01	28.509100000000000
2008-01-01	12.436400000000000
2009-01-01	26.286100000000000
2010-01-01	28.965700000000000
2011-01-01	23.638400000000000
2012-01-01	29.710800000000000
2013-01-01	29.712100000000000
2014-01-01	26.156800000000000
2015-01-01	24.883400000000000
2016-01-01	27.227300000000000