Quarter	Thousands of Persons, Seasonally Adjusted
1998-01-01	299.0741
1998-04-01	300.1716
1998-07-01	308.1588
1998-10-01	308.9124
1999-01-01	317.8794
1999-04-01	338.4454
1999-07-01	330.9061
1999-10-01	340.6794
2000-01-01	325.7708
2000-04-01	319.7472
2000-07-01	314.6587
2000-10-01	301.1508
2001-01-01	296.9172
2001-04-01	294.0614
2001-07-01	284.4985
2001-10-01	294.9299
2002-01-01	296.3010
2002-04-01	288.5050
2002-07-01	288.4352
2002-10-01	283.8088
2003-01-01	281.7643
2003-04-01	277.7089
2003-07-01	283.8093
2003-10-01	291.9989
2004-01-01	318.3545
2004-04-01	318.7552
2004-07-01	319.2293
2004-10-01	313.8706
2005-01-01	300.7945
2005-04-01	307.6062
2005-07-01	305.8772
2005-10-01	293.7061
2006-01-01	277.6669
2006-04-01	273.3983
2006-07-01	268.4415
2006-10-01	268.3764
2007-01-01	266.4263
2007-04-01	260.4941
2007-07-01	252.7335
2007-10-01	243.0862
2008-01-01	234.0646
2008-04-01	226.0083
2008-07-01	224.8440
2008-10-01	234.4587
2009-01-01	253.2650
2009-04-01	264.2303
2009-07-01	279.9817
2009-10-01	287.7309
2010-01-01	308.2514
2010-04-01	329.1504
2010-07-01	350.4094
2010-10-01	373.4168
2011-01-01	390.0381
2011-04-01	427.6362
2011-07-01	463.9828
2011-10-01	512.5632