Year	Percent
1999-01-01	12.709600000000000
2000-01-01	15.350400000000000
2001-01-01	14.595999999999998
2002-01-01	13.336100000000000
2003-01-01	18.410800000000000
2004-01-01	20.838600000000000
2005-01-01	23.819300000000000
2006-01-01	30.831600000000000
2007-01-01	31.050200000000000
2008-01-01	16.238700000000000
2009-01-01	23.983200000000000
2010-01-01	25.153500000000000
2011-01-01	18.141500000000000
2012-01-01	24.339600000000000
2013-01-01	28.922900000000000
2014-01-01	27.048600000000000
2015-01-01	29.491200000000000
2016-01-01	30.005700000000000