Year	Percent
1999-01-01	18.105100000000000
2000-01-01	11.257900000000000
2001-01-01	8.738110000000000
2002-01-01	8.260480000000001
2003-01-01	12.619600000000000
2004-01-01	15.436700000000000
2005-01-01	23.679700000000000
2006-01-01	27.700800000000000
2007-01-01	27.592800000000000
2008-01-01	15.010200000000000
2009-01-01	15.857900000000000
2010-01-01	17.346900000000000
2011-01-01	13.758300000000000
2012-01-01	15.562999999999999
2013-01-01	28.057500000000000
2014-01-01	28.915900000000000
2015-01-01	35.416600000000000
2016-01-01	31.483600000000000