Quarter	Percent
1999-07-01	75.4879893067352
1999-10-01	74.0837066956570
2000-01-01	69.1779826241903
2000-04-01	72.2220510112651
2000-07-01	72.2968063575405
2000-10-01	71.5940149709088
2001-01-01	67.7611315832793
2001-04-01	73.7300098309662
2001-07-01	73.6267096895226
2001-10-01	72.9469665247176
2002-01-01	70.6634295051902
2002-04-01	74.5618578643908
2002-07-01	75.4578456715422
2002-10-01	74.8591511286312
2003-01-01	70.2765846371773
2003-04-01	73.6967929350703
2003-07-01	73.2013466353692
2003-10-01	73.6730892678532
2004-01-01	71.7313088791952
2004-04-01	74.4859702093689
2004-07-01	74.1161731873947
2004-10-01	75.0174664990071
2005-01-01	72.0709093643039
2005-04-01	76.3601139774604
2005-07-01	75.1882517635361
2005-10-01	74.6285559587592
2006-01-01	72.5208480606978
2006-04-01	76.3551581100906
2006-07-01	75.1399112587582
2006-10-01	75.8746084524419
2007-01-01	74.4927153523488
2007-04-01	78.2670900648039
2007-07-01	77.7052182158134
2007-10-01	76.8958617842084
2008-01-01	74.5377413554008
2008-04-01	77.5366105755435
2008-07-01	76.7827127786695
2008-10-01	76.1484020382317
2009-01-01	73.8588109090909
2009-04-01	77.3013013075831
2009-07-01	77.2475299351176
2009-10-01	77.4915223979668
2010-01-01	75.2606101775636
2010-04-01	78.8383508672074
2010-07-01	78.3591127030980
2010-10-01	78.0082963944827
2011-01-01	76.6341616108529
2011-04-01	80.3705248795077
2011-07-01	78.9045448177128
2011-10-01	79.5970923952331
2012-01-01	77.0370672938865
2012-04-01	81.1387065850956
2012-07-01	80.2347077049384
2012-10-01	79.8270627472306
2013-01-01	77.2422249094267
2013-04-01	81.5465912035366
2013-07-01	81.5635767596893
2013-10-01	81.2347024397771
2014-01-01	80.0329833100554
2014-04-01	83.6116153711705
2014-07-01	82.3628140175679
2014-10-01	82.2570961847900
2015-01-01	80.8283849480976
2015-04-01	82.5688774738258
2015-07-01	82.2551164913926
2015-10-01	81.5585083301714
2016-01-01	79.7148604088318
2016-04-01	81.8311146018718
2016-07-01	82.5301147071856
2016-10-01	82.7865232333623
2017-01-01	81.5524216465226
2017-04-01	83.8152853811752
2017-07-01	82.9941322134329
2017-10-01	82.5891257771462
2018-01-01	80.9337431709759
2018-04-01	83.1725431419754
2018-07-01	82.4296143088759