Quarter	Percent
1978-01-01	62.0976705125538
1978-04-01	65.0329075701361
1978-07-01	64.5931132471714
1978-10-01	64.0131906692618
1979-01-01	62.4968720568785
1979-04-01	65.0925619476534
1979-07-01	64.9450135321479
1979-10-01	64.1219633987517
1980-01-01	62.4343697420084
1980-04-01	65.0780175940888
1980-07-01	65.0232873831690
1980-10-01	63.9965465610649
1981-01-01	62.5078274929882
1981-04-01	64.9161334026932
1981-07-01	64.6957862693903
1981-10-01	64.1547307303531
1982-01-01	62.7177066238265
1982-04-01	64.9745060357518
1982-07-01	64.4968102985178
1982-10-01	64.2439276388680
1983-01-01	63.1763488253671
1983-04-01	65.3963610314337
1983-07-01	65.1261223595810
1983-10-01	64.3382211425447
1984-01-01	62.5894869690922
1984-04-01	65.0076133895368
1984-07-01	64.9241215161636
1984-10-01	64.2612173918181
1985-01-01	62.7718284318566
1985-04-01	64.8089588658161
1985-07-01	64.5644149155343
1985-10-01	63.6889812254142
1986-01-01	62.5430856620521
1986-04-01	64.4395979927436
1986-07-01	64.4005360706048
1986-10-01	63.5504029947238
1987-01-01	62.1305568509328
1987-04-01	64.3373685995276
1987-07-01	64.3217250149884
1987-10-01	63.7725572218639
1988-01-01	62.4725080039872
1988-04-01	64.8363057481318
1988-07-01	64.5826460627724
1988-10-01	63.9503815351905
1989-01-01	62.8797711411450
1989-04-01	65.2911481462882
1989-07-01	65.1674227396094
1989-10-01	64.6810269687361
1990-01-01	63.6880565803078
1990-04-01	65.8660099117508
1990-07-01	65.6872675677953
1990-10-01	65.3131353016044
1991-01-01	64.3650690257909
1991-04-01	66.4307486342699
1991-07-01	66.3435134594574
1991-10-01	65.9163192405595
1992-01-01	64.9495629575599
1992-04-01	66.6432753468337
1992-07-01	66.3650354116992
1992-10-01	66.2080452580977
1993-01-01	64.5935734145608
1993-04-01	66.3972726123806
1993-07-01	66.1464912195172
1993-10-01	65.8035919999576
1994-01-01	64.3509242455331
1994-04-01	66.2335620114243
1994-07-01	65.7443196268096
1994-10-01	65.2068487380353
1995-01-01	64.1209673584493
1995-04-01	65.7439097100262
1995-07-01	65.7573892814920
1995-10-01	64.9366114771217
1996-01-01	63.9134090925515
1996-04-01	65.7750235990625
1996-07-01	65.9729240745015
1996-10-01	65.2199733888116
1997-01-01	64.5843065812527
1997-04-01	66.2110327008419
1997-07-01	66.0131291675228
1997-10-01	65.3078950313297
1998-01-01	64.3243161432974
1998-04-01	65.4608149202745
1998-07-01	65.1207036811279
1998-10-01	64.4682823307871
1999-01-01	63.3474017903321
1999-04-01	64.5962684837033
1999-07-01	64.5476851326904
1999-10-01	64.1803571194614
2000-01-01	62.9268457451724
2000-04-01	64.3001653321433
2000-07-01	64.2737641451732
2000-10-01	64.2070373366198
2001-01-01	63.2082026066465
2001-04-01	64.0136064085506
2001-07-01	63.7220729951335
2001-10-01	63.3435184052719
2002-01-01	62.2664236021768
2002-04-01	63.0219361301144
2002-07-01	63.1851649345185
2002-10-01	62.9076622714210
2003-01-01	61.8728229186421
2003-04-01	63.0718439919094
2003-07-01	63.1203865505662
2003-10-01	62.8891785318004
2004-01-01	62.0749842289450
2004-04-01	63.2923224642990
2004-07-01	63.4573424284432
2004-10-01	63.0792160531351
2005-01-01	62.3582009192850
2005-04-01	63.7895910622042
2005-07-01	64.0129773227130
2005-10-01	63.5103906921382
2006-01-01	62.9293232437945
2006-04-01	64.2656554130974
2006-07-01	64.3451501900825
2006-10-01	64.1530930917775
2007-01-01	63.4063540526747
2007-04-01	65.0369560760406
2007-07-01	64.6852140484814
2007-10-01	64.5798264382819
2008-01-01	63.7377473554841
2008-04-01	64.9779068686381
2008-07-01	64.5694978089761
2008-10-01	64.4068725293479
2009-01-01	63.5381667865929
2009-04-01	63.9768857703023
2009-07-01	63.6914898693633
2009-10-01	63.4900304070910
2010-01-01	63.2051699870517
2010-04-01	63.8778484238371
2010-07-01	63.9891165802233
2010-10-01	63.8423365128932
2011-01-01	63.5213430590218
2011-04-01	64.2171359448807
2011-07-01	64.0161929990574
2011-10-01	64.1140607031590
2012-01-01	63.4563146768055
2012-04-01	64.2706219560205
2012-07-01	64.3080812694380
2012-10-01	64.3877658852143
2013-01-01	64.1837909033299
2013-04-01	65.0943397339381
2013-07-01	65.1128529070464
2013-10-01	65.4249168048531
2014-01-01	64.9321412597860
2014-04-01	65.7903614058848
2014-07-01	65.8487189275740
2014-10-01	65.9322081282093
2015-01-01	65.5566704338539
2015-04-01	66.1995979026758
2015-07-01	66.4364419150758
2015-10-01	66.5220336618524
2016-01-01	66.3153157674074
2016-04-01	67.1021874879559
2016-07-01	67.5093795164796
2016-10-01	67.6275989529749
2017-01-01	67.1604601692311
2017-04-01	68.1497979064298
2017-07-01	68.4900607254794
2017-10-01	68.5315240971459
2018-01-01	68.8578900176856
2018-04-01	69.8976368035042
2018-07-01	70.0240888880791