Quarter	Percent
1999-04-01	81.1929070392262
2000-04-01	82.5630252100840
2001-04-01	82.1150855365474
2002-04-01	80.6468172484600
2003-01-01	76.6683647478349
2003-04-01	79.7872340425532
2003-07-01	80.9187279151944
2003-10-01	77.1225216065074
2004-01-01	76.2481089258699
2004-04-01	78.5929648241206
2004-07-01	78.9738430583501
2004-10-01	77.2795216741405
2005-01-01	77.0418326693227
2005-04-01	80.4853888063398
2005-07-01	80.8075772681954
2005-10-01	78.7893700787402
2006-01-01	78.8246721709568
2006-04-01	81.0114503816794
2006-07-01	81.1669829222011
2006-10-01	79.4799054373522
2007-01-01	80.0841514726508
2007-04-01	81.6044260027662
2007-07-01	81.5356489945156
2007-10-01	79.9088838268793
2008-01-01	78.7079162875341
2008-04-01	80.9887640449438
2008-07-01	80.4975566414927
2008-10-01	77.7628635346756
2009-01-01	73.3809736489504
2009-04-01	73.8646482635797
2009-07-01	76.2956286615592
2009-10-01	74.5380802163136
2010-01-01	73.2793522267206
2010-04-01	75.1121076233184
2010-07-01	75.0559785042544
2010-10-01	73.7265415549598
2011-01-01	72.4774774774775
2011-04-01	75.3907994640464
2011-07-01	75.3887161261661
2011-10-01	73.4375000000000
2012-01-01	73.0165844912595
2012-04-01	76.1287438533751
2012-07-01	76.3758389261745
2012-10-01	74.8326639892905
2013-01-01	73.7261852015950
2013-04-01	76.8821966341896
2013-07-01	78.3831282952548
2013-10-01	76.3676148796499
2014-01-01	74.9453432444250
2014-04-01	78.3085013146363
2014-07-01	79.1504117902037