Year	Percent
2005-01-01	68.8979454936703
2006-01-01	69.7453216353183
2007-01-01	69.9489270631413
2008-01-01	69.8470246440371
2009-01-01	69.3360722250386
2010-01-01	69.0912929502668
2011-01-01	69.6261515478924
2012-01-01	70.5980467860516
2013-01-01	70.6425117204301
2014-01-01	70.1100186638800
2015-01-01	70.8145577642421
2016-01-01	71.2029860369377
2017-01-01	71.3256151213614