Year	Percent
1999-01-01	13.630000000000000
2000-01-01	22.230999999999998
2001-01-01	16.272000000000002
2002-01-01	14.477000000000000
2003-01-01	17.386000000000000
2004-01-01	18.850000000000000
2005-01-01	20.132100000000000
2006-01-01	26.224300000000000
2007-01-01	25.933500000000000
2008-01-01	12.749100000000000
2009-01-01	18.794700000000000
2010-01-01	22.328800000000000
2011-01-01	17.173700000000000
2012-01-01	21.178100000000000
2013-01-01	23.631400000000000
2014-01-01	22.576300000000000
2015-01-01	25.531000000000000
2016-01-01	27.268800000000000