Quarter	Percent
1986-01-01	85.4487179487179
1986-04-01	84.6393547795802
1986-07-01	83.8789546079780
1986-10-01	83.9967060115290
1987-01-01	84.3872616114609
1987-04-01	83.2345701522472
1987-07-01	82.9448187943908
1987-10-01	82.8958125170315
1988-01-01	81.4240362811791
1988-04-01	80.1850843767011
1988-07-01	78.3232011614191
1988-10-01	79.1606236403191
1989-01-01	78.2348677056905
1989-04-01	76.9746984673982
1989-07-01	76.4572568216844
1989-10-01	77.5246361088509
1990-01-01	77.0277577505407
1990-04-01	76.2303193882141
1990-07-01	75.3995331298258
1990-10-01	75.9259259259259
1991-01-01	74.6524064171123
1991-04-01	73.6729794611896
1991-07-01	72.5772097976571
1991-10-01	73.1681415929204
1992-01-01	73.3127481252757
1992-04-01	73.0522052997623
1992-07-01	72.1655827034628
1992-10-01	73.2556100981767
1993-01-01	73.4597570567159
1993-04-01	73.6484129752354
1993-07-01	73.3704638412671
1993-10-01	74.8829141370338
1994-01-01	74.7883186452393
1994-04-01	75.4458516412510
1994-07-01	75.6529209621993
1994-10-01	76.9724456614753
1995-01-01	77.8014486578611
1995-04-01	77.9429250891796
1995-07-01	77.9028436018957
1995-10-01	79.1392959407108
1996-01-01	78.6558283750943
1996-04-01	78.3567134268537
1996-07-01	78.2735370015816
1996-10-01	78.8692696675786
1997-01-01	78.4127508464778
1997-04-01	77.8803362452612
1997-07-01	77.6781306565740
1997-10-01	78.5491547677663
1998-01-01	77.8824107435310
1998-04-01	76.6303903117584
1998-07-01	75.8750408897612
1998-10-01	76.5738548215890
1999-01-01	76.6250713644890
1999-04-01	76.0133757442297
1999-07-01	76.3042060645582
1999-10-01	78.3715633642427
2000-01-01	77.7976287152834
2000-04-01	77.0280146163216
2000-07-01	77.4703877981502
2000-10-01	78.9814589911748
2001-01-01	78.7984151370583
2001-04-01	77.8881887219260
2001-07-01	78.3326621022956
2001-10-01	79.3929200704789
2002-01-01	80.2371856096784
2002-04-01	79.0624010136205
2002-07-01	78.7565991647624
2002-10-01	79.8402881077272
2003-01-01	79.4792071511854
2003-04-01	78.6271933214810
2003-07-01	78.9336000615527
2003-10-01	79.7351094778748
2004-01-01	80.0152380952381
2004-04-01	80.2399756986634
2004-07-01	80.2211116159322
2004-10-01	82.0245907822283
2005-01-01	81.2777151446824
2005-04-01	80.4274465691789
2005-07-01	81.0521589463444
2005-10-01	82.5577926920209
2006-01-01	82.0815689770448
2006-04-01	81.7973203049819
2006-07-01	81.3479160508424
2006-10-01	82.3837252155967
2007-01-01	82.0808823529412
2007-04-01	81.6298038063046
2007-07-01	81.8001615153072
2007-10-01	82.4055083504249
2008-01-01	80.8566625246692
2008-04-01	81.1317999269806
2008-07-01	80.2363755745240
2008-10-01	81.4448004660646
2009-01-01	79.3446672478931
2009-04-01	79.3125951707636
2009-07-01	77.3878437047757
2009-10-01	78.4807387101428
2010-01-01	78.3396877922452
2010-04-01	77.6987207129510
2010-07-01	78.3323757540936
2010-10-01	78.4705798036265
2011-01-01	78.6061820263309
2011-04-01	77.9033989266548
2011-07-01	78.0060120240481
2011-10-01	78.5121602288984
2012-01-01	78.6296667143470
2012-04-01	77.4676114809248
2012-07-01	76.5699964196205
2012-10-01	77.0457796852646
2013-01-01	77.8500000000000
2013-04-01	77.7310024973243
2013-07-01	77.9438986188239
2013-10-01	79.4780882144376
2014-01-01	79.6315900910438
2014-04-01	79.7048489107519
2014-07-01	79.1468531468531
2014-10-01	80.2849200833912
2015-01-01	80.4522196100124
2015-04-01	79.7732737890759
2015-07-01	78.4112660650807
2015-10-01	79.8085409735895
2016-01-01	79.9919104759337
2016-04-01	80.4734911637212
2016-07-01	80.5295640055744
2016-10-01	81.7510061357788
2017-01-01	82.3039601363756
2017-04-01	80.9992824995108
2017-07-01	81.6009868207492
2017-10-01	82.6261060517988
2018-01-01	82.5961353277268
2018-04-01	81.8687288298076
2018-07-01	81.8963321446765