Year	Percent
2000-01-01	63.0128415342206
2001-01-01	61.5358630785574
2002-01-01	60.5891786351338
2003-01-01	60.4182366003300
2004-01-01	59.8435235191356
2005-01-01	60.7904479123442
2006-01-01	64.0914589538319
2007-01-01	66.8400682385773
2008-01-01	69.0210129407643
2009-01-01	70.3854408559097
2010-01-01	69.8612905068826
2011-01-01	70.2164287155064
2012-01-01	69.2666118061658
2013-01-01	69.6580459249535
2014-01-01	67.7024452595122
2015-01-01	66.2100238387148
2016-01-01	65.7257340133734
2017-01-01	65.7516391191927