Quarter	Percent
1999-04-01	85.7446808510638
2000-04-01	86.6805411030177
2001-04-01	87.0636550308008
2002-04-01	84.3495934959350
2003-01-01	80.0607287449393
2003-04-01	83.9195979899498
2003-07-01	84.1365461847390
2003-10-01	81.0920121334681
2004-01-01	79.3969849246231
2004-04-01	82.4175824175824
2004-07-01	84.1365461847390
2004-10-01	82.2420634920635
2005-01-01	79.5073891625616
2005-04-01	85.1272015655577
2005-07-01	86.4573110893032
2005-10-01	82.0837390457644
2006-01-01	82.3977164605138
2006-04-01	85.6610800744879
2006-07-01	86.0146252285192
2006-10-01	84.3263061411549
2007-01-01	84.2248413417951
2007-04-01	85.4853072128228
2007-07-01	86.3436123348018
2007-10-01	85.1232394366197
2008-01-01	83.2599118942731
2008-04-01	85.7885615251300
2008-07-01	84.8927038626610
2008-10-01	80.7458803122290
2009-01-01	75.5030621172354
2009-04-01	76.7015706806283
2009-07-01	79.2951541850220
2009-10-01	76.0850310008857
2010-01-01	75.1785714285714
2010-04-01	78.1333333333333
2010-07-01	78.1333333333333
2010-10-01	76.3555555555556
2011-01-01	73.7837837837838
2011-04-01	77.0186335403727
2011-07-01	78.6654960491659
2011-10-01	77.2364924712134
2012-01-01	75.4432624113475
2012-04-01	78.2801418439716
2012-07-01	79.2736935341010
2012-10-01	76.6784452296820
2013-01-01	75.9194395796848
2013-04-01	79.7202797202797
2013-07-01	81.2500000000000
2013-10-01	78.7958115183246
2014-01-01	77.7292576419214
2014-04-01	81.7626527050611
2014-07-01	82.4742268041237