Quarter	Percent, Seasonally Adjusted
1999-01-01	64.1031974509780
1999-04-01	65.3593796625157
1999-07-01	63.0748276305144
1999-10-01	64.6576535604532
2000-01-01	65.8838233802559
2000-04-01	63.0742151422914
2000-07-01	64.3327951235619
2000-10-01	65.3454182032949
2001-01-01	64.8392982033710
2001-04-01	65.0531741344263
2001-07-01	61.7875135505764
2001-10-01	65.5702559465321
2002-01-01	65.2514553621206
2002-04-01	64.8276398088390
2002-07-01	63.5333151893222
2002-10-01	63.7920843392635
2003-01-01	64.9047059735108
2003-04-01	64.8135762045799
2003-07-01	65.4047470291057
2003-10-01	64.3222308065615
2004-01-01	64.5087158875026
2004-04-01	64.7602098376299
2004-07-01	64.1624444216652
2004-10-01	65.5440919485852
2005-01-01	64.1702538811232
2005-04-01	65.5653121436838
2005-07-01	65.9029168155914
2005-10-01	64.5937759670218
2006-01-01	64.0265025452912
2006-04-01	65.8962295179582
2006-07-01	66.3977050320206
2006-10-01	64.9856027853725
2007-01-01	65.9124277804654
2007-04-01	65.2433458915567
2007-07-01	66.8725718130078
2007-10-01	66.4836102654494
2008-01-01	66.3096427935122
2008-04-01	67.2002265194720
2008-07-01	66.3181483131395
2008-10-01	66.8562149114529
2009-01-01	67.7488113054540
2009-04-01	66.7808935166213
2009-07-01	68.2999483376928
2009-10-01	67.3391087537981
2010-01-01	67.4348379806204
2010-04-01	67.6961167984519
2010-07-01	66.9463237170800
2010-10-01	67.9615554281346
2011-01-01	67.2168990822675
2011-04-01	68.4089153230409
2011-07-01	68.5800150816589
2011-10-01	67.8697215993416
2012-01-01	68.1514503977547
2012-04-01	68.6910436217487
2012-07-01	69.5409617063012
2012-10-01	67.7058670750693
2013-01-01	69.3198843035585
2013-04-01	67.7581091856910
2013-07-01	68.9894727737273
2013-10-01	69.9781682563705
2014-01-01	69.7959896129730
2014-04-01	69.6793176532875
2014-07-01	69.8509379489038
2014-10-01	69.8823085430364
2015-01-01	68.7490562586782
2015-04-01	70.0064983315504
2015-07-01	70.8505578827860
2015-10-01	70.3775241238910
2016-01-01	70.4863575826042
2016-04-01	70.7813386876851
2016-07-01	72.7345804006067
2016-10-01	72.1629253629496
2017-01-01	72.6235929249819
2017-04-01	72.6339512225277
2017-07-01	70.3578258132254
2017-10-01	72.0558244589799
2018-01-01	71.5962544387970
2018-04-01	70.6969194722089