Quarter	Percent
1999-07-01	75.0934304311493
1999-10-01	75.6292564916535
2000-01-01	74.1205763288819
2000-04-01	75.6174178669798
2000-07-01	75.4859927156183
2000-10-01	75.7590051445800
2001-01-01	74.1165436217083
2001-04-01	75.9912815978151
2001-07-01	75.4180174821714
2001-10-01	75.8110364028693
2002-01-01	74.7418909094248
2002-04-01	76.3409663765624
2002-07-01	75.8249639340074
2002-10-01	75.9506561313863
2003-01-01	74.7828106665142
2003-04-01	76.0264508150316
2003-07-01	75.3551384942215
2003-10-01	75.7437631291219
2004-01-01	75.4513804012493
2004-04-01	76.4834963373036
2004-07-01	75.8291050786942
2004-10-01	76.1657015864350
2005-01-01	75.2829784930873
2005-04-01	76.4886572563054
2005-07-01	75.9489543315543
2005-10-01	76.5239682836524
2006-01-01	75.7255385491179
2006-04-01	76.9288807648430
2006-07-01	76.4112501869222
2006-10-01	76.5830730162234
2007-01-01	75.6916702455419
2007-04-01	76.9978799203764
2007-07-01	76.4101886673562
2007-10-01	76.8213057652734
2008-01-01	75.8671995045827
2008-04-01	77.1188031042652
2008-07-01	76.5090171142415
2008-10-01	76.8403277570652
2009-01-01	75.4571649886483
2009-04-01	76.5530645149069
2009-07-01	75.7958402239419
2009-10-01	76.0659310890182
2010-01-01	75.6508365018738
2010-04-01	76.8945337318333
2010-07-01	76.5592819473126
2010-10-01	76.6268193092423
2011-01-01	76.0720733679827
2011-04-01	77.5751872544524
2011-07-01	76.7273888587758
2011-10-01	76.9876531442679
2012-01-01	76.3675911168498
2012-04-01	77.5823465234626
2012-07-01	77.1104283082155
2012-10-01	76.9555997358903
2013-01-01	76.2076242376493
2013-04-01	77.6795041622474
2013-07-01	77.5605800074718
2013-10-01	77.7718281943076
2014-01-01	77.6392351800757
2014-04-01	78.7235911561156
2014-07-01	78.4545464494386
2014-10-01	78.4803198259984
2015-01-01	77.9264463222886
2015-04-01	78.8455099069300
2015-07-01	78.6633903875624
2015-10-01	78.7007214885626
2016-01-01	78.4312836515126
2016-04-01	78.9946518978641
2016-07-01	78.9915834884029
2016-10-01	78.9047821919224
2017-01-01	78.7580175498513
2017-04-01	79.3997224284050
2017-07-01	79.1676882939372
2017-10-01	79.1164173901178
2018-01-01	78.8993802750002
2018-04-01	79.7371752490611
2018-07-01	79.3624055562026