Quarter	Percent
1999-07-01	75.2808220869916
1999-10-01	75.1071655447949
2000-01-01	73.6169685373278
2000-04-01	74.7109238422978
2000-07-01	74.8926590187877
2000-10-01	74.5588686706630
2001-01-01	72.8893908760486
2001-04-01	74.9909774126688
2001-07-01	74.9624864309139
2001-10-01	74.7567352727090
2002-01-01	73.9976447035355
2002-04-01	75.5281007665457
2002-07-01	75.5102351571475
2002-10-01	75.2619769647888
2003-01-01	74.1658614330004
2003-04-01	75.1188302422938
2003-07-01	74.9918413375902
2003-10-01	75.1961984146359
2004-01-01	74.6156264612004
2004-04-01	75.5694532211881
2004-07-01	75.2016702546132
2004-10-01	75.4888751098293
2005-01-01	74.3720143533922
2005-04-01	75.5731013809281
2005-07-01	74.9005925879873
2005-10-01	74.5396113458958
2006-01-01	73.6563129629811
2006-04-01	75.0882547201507
2006-07-01	74.7262842733659
2006-10-01	74.4446945869327
2007-01-01	73.6124259406526
2007-04-01	75.1131235796791
2007-07-01	74.6962967880974
2007-10-01	74.2335471449031
2008-01-01	73.0010372610357
2008-04-01	74.5301721987208
2008-07-01	74.1076971849212
2008-10-01	73.4720316298891
2009-01-01	72.1596561986295
2009-04-01	74.0646685377762
2009-07-01	73.6177711863629
2009-10-01	73.0149325000812
2010-01-01	72.1964752721761
2010-04-01	73.8407997094886
2010-07-01	73.5533859471399
2010-10-01	73.1552262453715
2011-01-01	72.4163077992640
2011-04-01	74.0198025332711
2011-07-01	73.5824270000066
2011-10-01	73.4234684471874
2012-01-01	72.5232176527461
2012-04-01	74.2754065444481
2012-07-01	74.0419461546684
2012-10-01	73.3375445448281
2013-01-01	72.2140824164697
2013-04-01	74.1106000294092
2013-07-01	74.0561416978593
2013-10-01	73.8040822393817
2014-01-01	73.5426967748966
2014-04-01	74.8407465045565
2014-07-01	74.8251628803298
2014-10-01	74.2244585229926
2015-01-01	73.4327337370699
2015-04-01	74.7199020025680
2015-07-01	74.4828723694968
2015-10-01	73.8125909634262
2016-01-01	73.1581302499433
2016-04-01	74.3423705050825
2016-07-01	74.5959945497327
2016-10-01	73.8820448268195
2017-01-01	73.2646533129529
2017-04-01	74.6890556775230
2017-07-01	74.4092188465373
2017-10-01	73.8419930386004
2018-01-01	73.2117930363558
2018-04-01	74.2947215753792
2018-07-01	73.9600463363940