Year	Percent
1999-01-01	23.050200000000000
2000-01-01	29.388500000000000
2001-01-01	25.157800000000000
2002-01-01	21.057300000000000
2003-01-01	22.997600000000000
2004-01-01	23.701400000000000
2005-01-01	26.958700000000000
2006-01-01	29.451999999999998
2007-01-01	27.735200000000000
2008-01-01	15.710300000000000
2009-01-01	20.688400000000000
2010-01-01	21.647600000000000
2011-01-01	17.222500000000000
2012-01-01	21.089600000000000
2013-01-01	24.506500000000000
2014-01-01	24.154800000000000
2015-01-01	28.202700000000000
2016-01-01	29.013900000000000