Quarter	Percent, Seasonally Adjusted
1998-04-01	55.7734276833543
1999-04-01	56.1070335384919
2000-04-01	55.8281807177675
2001-04-01	56.7938931297710
2002-04-01	57.4657292368936
2003-04-01	56.7934609757649
2004-04-01	56.2949186735594
2005-04-01	56.3179602549681
2006-04-01	56.9484906712949
2007-04-01	57.2341536854395
2008-04-01	58.8631604503657
2009-04-01	58.7816195180362
2010-01-01	56.7557605070061
2010-04-01	56.6896125711167
2010-07-01	56.9749318342698
2010-10-01	57.0375466409044
2011-01-01	57.4070487873731
2011-04-01	57.9015744233260
2011-07-01	57.2697168376306
2011-10-01	57.9470225050377
2012-01-01	57.9863724525610
2012-04-01	57.8734855043552
2012-07-01	58.2680020498457
2012-10-01	57.6968954387417
2013-01-01	57.8291926498676
2013-04-01	57.9614843863333
2013-07-01	58.2707049725321
2013-10-01	58.4805582612611
2014-01-01	58.0125671805402
2014-04-01	58.6149506391232
2014-07-01	58.6892182437119
2014-10-01	59.9423440378650
2015-01-01	59.4500589146584
2015-04-01	59.0624260859900
2015-07-01	58.9058810658077
2015-10-01	59.4719072990192
2016-01-01	59.9038531943403
2016-04-01	59.5061815570377
2016-07-01	59.4365176873848
2016-10-01	59.9154612674930
2017-01-01	59.6732429160266
2017-04-01	59.3401649184230
2017-07-01	59.2258378788057
2017-10-01	59.5360720962013
2018-01-01	59.6152445947342
2018-04-01	59.2723982227228