Quarter	Percent
2005-01-01	83.5718502918391
2005-04-01	83.1651059372946
2005-07-01	84.0323575528303
2005-10-01	83.8288774789086
2006-01-01	83.7848841490734
2006-04-01	84.1945689064286
2006-07-01	84.5511536303990
2006-10-01	84.2950205788166
2007-01-01	83.5625458702146
2007-04-01	83.6542566578748
2007-07-01	83.7033656116625
2007-10-01	84.2706333961369
2008-01-01	83.4160362995369
2008-04-01	83.5575716770594
2008-07-01	83.9375222202904
2008-10-01	82.8248822160097
2009-01-01	82.4089118513093
2009-04-01	82.3107510114829
2009-07-01	82.9102230688884
2009-10-01	83.0934495913335
2010-01-01	82.0373889845050
2010-04-01	82.9387842692051
2010-07-01	82.8249016103688
2010-10-01	81.9903834408941
2011-01-01	81.6893477211643
2011-04-01	82.2575357523964
2011-07-01	82.7142865634191
2011-10-01	82.7853316384754
2012-01-01	82.0265786683392
2012-04-01	82.9847010840352
2012-07-01	83.4746124323044
2012-10-01	82.3941308529808
2013-01-01	81.7403541841221
2013-04-01	82.5270109643392
2013-07-01	82.6677472163066
2013-10-01	82.8145488103706
2014-01-01	82.0317480574024
2014-04-01	82.1045882208338
2014-07-01	82.6590785047595
2014-10-01	82.0245891217836
2015-01-01	81.5997378816344
2015-04-01	81.8362427575441
2015-07-01	82.1152508499597
2015-10-01	82.2975753165475
2016-01-01	81.2984756030660
2016-04-01	81.6957114771837
2016-07-01	82.3636200034963
2016-10-01	82.0219469683204
2017-01-01	81.5466229857181
2017-04-01	81.7840583706038
2017-07-01	82.0219471741904
2017-10-01	81.7609182458754
2018-01-01	81.3935617004094
2018-04-01	81.7664628183912