Quarter	Index source base
2011-07-01	100.00000000
2011-10-01	100.09584240
2012-01-01	97.47966753
2012-04-01	99.02790193
2012-07-01	99.85263371
2012-10-01	99.36324134
2013-01-01	95.50288644
2013-04-01	98.44948773
2013-07-01	99.36777848
2013-10-01	98.39259961
2014-01-01	96.21469157
2014-04-01	97.86133057
2014-07-01	96.42628875
2014-10-01	96.04648017
2015-01-01	95.17260354
2015-04-01	95.93932733
2015-07-01	94.58552917
2015-10-01	96.97636861
2016-01-01	93.82062527
2016-04-01	96.03883907
2016-07-01	94.99154005
2016-10-01	95.67135723
2017-01-01	93.00227431
2017-04-01	92.54203921
2017-07-01	91.50707079
2017-10-01	91.08296659
2018-01-01	88.39793995
2018-04-01	89.77896714
2018-07-01	89.76124448