Year	Percent
2000-01-01	58.4981049785348
2001-01-01	59.0372895081647
2002-01-01	60.0602322227763
2003-01-01	59.3981361671852
2004-01-01	60.0488167550559
2005-01-01	59.8922910393703
2006-01-01	60.0215896958332
2007-01-01	60.1342388982666
2008-01-01	59.7716934254876
2009-01-01	58.7750408977050
2010-01-01	58.8665198628141
2011-01-01	59.2588409297506
2012-01-01	59.6182395108711
2013-01-01	59.8016330050637
2014-01-01	60.5127888441009
2015-01-01	60.5399700455469
2016-01-01	60.5619912894476
2017-01-01	60.8333802147226