Quarter	Percent
1999-04-01	76.1129207383279
2000-04-01	77.7306468716861
2001-04-01	76.6492146596859
2002-04-01	76.1410788381743
2003-01-01	73.2307692307692
2003-04-01	75.5873340143003
2003-07-01	77.7439024390244
2003-10-01	73.1083844580777
2004-01-01	73.1509625126646
2004-04-01	74.7219413549040
2004-07-01	73.8647830474268
2004-10-01	72.2722722722723
2005-01-01	74.5216515609265
2005-04-01	75.8032128514056
2005-07-01	74.8987854251012
2005-10-01	75.4228855721393
2006-01-01	75.1984126984127
2006-04-01	76.1252446183953
2006-07-01	75.9368836291913
2006-10-01	74.2187500000000
2007-01-01	75.7722007722008
2007-04-01	77.4378585086042
2007-07-01	76.3532763532764
2007-10-01	74.3856332703214
2008-01-01	73.8476011288805
2008-04-01	75.8169934640523
2008-07-01	75.8525345622120
2008-10-01	74.5152354570637
2009-01-01	71.2328767123288
2009-04-01	70.9736123748863
2009-07-01	73.1549815498155
2009-10-01	73.0275229357798
2010-01-01	71.4156079854810
2010-04-01	72.0361990950226
2010-07-01	71.9314079422383
2010-10-01	71.0691823899371
2011-01-01	71.1711711711712
2011-04-01	73.7410071942446
2011-07-01	72.0972097209721
2011-10-01	69.5769576957696
2012-01-01	70.5349048050771
2012-04-01	73.9404869251578
2012-07-01	73.4177215189874
2012-10-01	72.8584310189360
2013-01-01	71.4798206278027
2013-04-01	73.9676840215440
2013-07-01	75.3777777777778
2013-10-01	73.9244951712028
2014-01-01	72.1541155866900
2014-04-01	74.7359154929578
2014-07-01	75.7655293088364