Year	Percent
1999-01-01	15.288700000000000
2000-01-01	15.945100000000000
2001-01-01	12.839000000000000
2002-01-01	13.030400000000000
2003-01-01	21.012500000000000
2004-01-01	25.223200000000000
2005-01-01	24.585400000000000
2006-01-01	30.746300000000000
2007-01-01	31.637400000000000
2008-01-01	22.307200000000000
2009-01-01	29.427800000000000
2010-01-01	26.440400000000000
2011-01-01	18.709400000000000
2012-01-01	20.061600000000000
2013-01-01	21.743000000000002
2014-01-01	16.110600000000000
2015-01-01	16.915200000000000
2016-01-01	15.337800000000000