Quarter	Thousands of Persons, Seasonally Adjusted
1999-01-01	509.5583
1999-04-01	517.8388
1999-07-01	514.2599
1999-10-01	517.1552
2000-01-01	513.6261
2000-04-01	516.6531
2000-07-01	526.3286
2000-10-01	524.9517
2001-01-01	525.9649
2001-04-01	526.5051
2001-07-01	531.9796
2001-10-01	529.8705
2002-01-01	537.7985
2002-04-01	530.8674
2002-07-01	516.3828
2002-10-01	515.9154
2003-01-01	518.5463
2003-04-01	521.2046
2003-07-01	516.9610
2003-10-01	535.1388
2004-01-01	539.7856
2004-04-01	544.4592
2004-07-01	549.3504
2004-10-01	546.2234
2005-01-01	545.8805
2005-04-01	544.2533
2005-07-01	548.8403
2005-10-01	555.2761
2006-01-01	551.0349
2006-04-01	551.8119
2006-07-01	550.6509
2006-10-01	548.1848
2007-01-01	555.9656
2007-04-01	564.6797
2007-07-01	564.1510
2007-10-01	562.0504
2008-01-01	562.4676
2008-04-01	561.8773
2008-07-01	572.6843
2008-10-01	564.3939
2009-01-01	552.1259
2009-04-01	564.8404
2009-07-01	569.5060
2009-10-01	568.6364
2010-01-01	570.9028
2010-04-01	565.4874
2010-07-01	560.5766
2010-10-01	564.7343
2011-01-01	557.2233
2011-04-01	553.3660
2011-07-01	548.2057
2011-10-01	545.5978