Quarter	Percent, Seasonally Adjusted
1999-01-01	52.1947661874869
1999-04-01	51.9904976442180
1999-07-01	52.1939088347930
1999-10-01	52.3561535811102
2000-01-01	53.0990485545888
2000-04-01	54.6427031277194
2000-07-01	55.6251118688708
2000-10-01	56.3883878598612
2001-01-01	57.1631036765187
2001-04-01	57.7124855568346
2001-07-01	57.8681530576805
2001-10-01	58.1169873234312
2002-01-01	57.9835705985399
2002-04-01	58.2866619185632
2002-07-01	58.5294728180469
2002-10-01	59.0851559264232
2003-01-01	59.0702463670976
2003-04-01	59.0702230642709
2003-07-01	58.7734012889196
2003-10-01	59.2795687204866
2004-01-01	58.6827660989212
2004-04-01	58.1363053834241
2004-07-01	58.4396340136175
2004-10-01	58.5733574765929
2005-01-01	58.8854258307263
2005-04-01	59.2455575212675
2005-07-01	59.1529379571453
2005-10-01	60.1575844591256
2006-01-01	60.2799998743420
2006-04-01	60.4280654941524
2006-07-01	60.0669987081027
2006-10-01	59.8480497010050
2007-01-01	59.0975946408199
2007-04-01	59.7040608554524
2007-07-01	59.8797685700031
2007-10-01	59.8431397592439
2008-01-01	60.6242245627443
2008-04-01	61.0217122126531
2008-07-01	60.5179753430095
2008-10-01	59.9032219792640
2009-01-01	58.2318064278638
2009-04-01	57.1430353409589
2009-07-01	55.3807647433035
2009-10-01	54.8373965677802
2010-01-01	54.5525322654627
2010-04-01	54.6844122827516
2010-07-01	54.5731702053693
2010-10-01	54.1532923718660
2011-01-01	54.4957195227365
2011-04-01	54.0784105173176
2011-07-01	53.2416061276559
2011-10-01	53.2542195111168
2012-01-01	52.4314630471194
2012-04-01	52.6082621826913
2012-07-01	51.9577900817509
2012-10-01	51.4086434886161
2013-01-01	50.4540040887176
2013-04-01	50.2758140117104
2013-07-01	50.7951601268996
2013-10-01	50.4897935200611
2014-01-01	49.9371403771490
2014-04-01	50.8575485993799
2014-07-01	51.5349872607650
2014-10-01	52.2868291721203
2015-01-01	53.0311850762756
2015-04-01	53.7801846815954
2015-07-01	54.2797179843468
2015-10-01	54.8429977037405
2016-01-01	55.5961151164988
2016-04-01	55.2604612575103
2016-07-01	55.8520243095542
2016-10-01	56.0768878062008
2017-01-01	56.7238157422902
2017-04-01	57.6802269516396
2017-07-01	58.2452424343080
2017-10-01	58.4606269326210
2018-01-01	58.6720718112147
2018-04-01	59.4377438187248
2018-07-01	60.0977757434634