Year	Percent
2000-01-01	21.600000000000000
2001-01-01	18.200000000000000
2002-01-01	20.100000000000000
2003-01-01	22.300000000000000
2004-01-01	19.400000000000000
2005-01-01	19.300000000000000
2006-01-01	21.300000000000000
2007-01-01	20.200000000000000
2008-01-01	17.500000000000000
2009-01-01	17.800000000000000
2010-01-01	16.179000000000002
2011-01-01	16.076700000000000
2012-01-01	17.322600000000000
2013-01-01	19.816900000000000
2014-01-01	18.717800000000000
2015-01-01	21.276700000000000
2016-01-01	22.685900000000000