Year	Percent
2005-01-01	27.6565342096048
2006-01-01	28.6390497433382
2007-01-01	29.0021615641700
2008-01-01	29.0947099140649
2009-01-01	29.3698214572537
2010-01-01	29.3744491938895
2011-01-01	29.7226494691796
2012-01-01	30.7661506168503
2013-01-01	30.8210006289766
2014-01-01	30.2485605096661
2015-01-01	30.8190272505525
2016-01-01	31.1838192432890
2017-01-01	31.1924533972569