Quarter	Index source base
2011-07-01	100.00000000
2011-10-01	99.47622806
2012-01-01	98.49166262
2012-04-01	97.87176921
2012-07-01	97.84144075
2012-10-01	97.28751122
2013-01-01	97.11227032
2013-04-01	97.09747639
2013-07-01	97.26239275
2013-10-01	97.39779944
2014-01-01	98.23043566
2014-04-01	98.08425222
2014-07-01	98.53106998
2014-10-01	98.69079644
2015-01-01	98.74982859
2015-04-01	98.57660983
2015-07-01	98.40606995
2015-10-01	97.64158052
2016-01-01	98.42526977
2016-04-01	98.66501441
2016-07-01	98.82076471
2016-10-01	98.71881546
2017-01-01	98.94045819
2017-04-01	98.92412447
2017-07-01	99.60213790
2017-10-01	99.16232329
2018-01-01	98.30511360
2018-04-01	98.17705054
2018-07-01	98.24848820