Year	Percent
1996-01-01	38.073300000000000
1997-01-01	47.231700000000000
1998-01-01	34.240300000000000
1999-01-01	29.449300000000000
2000-01-01	28.975800000000000
2001-01-01	22.831100000000000
2002-01-01	23.000700000000000
2003-01-01	22.973600000000000
2004-01-01	19.320300000000000
2005-01-01	20.211800000000000
2006-01-01	21.908100000000000
2007-01-01	29.779500000000000
2008-01-01	26.536600000000000
2009-01-01	23.098300000000000
2010-01-01	22.831999999999997
2011-01-01	15.237700000000000
2012-01-01	14.733400000000000
2013-01-01	20.163700000000000
2014-01-01	19.271900000000000