Quarter	Thousands of Persons, Seasonally Adjusted
1998-04-01	3272
1999-04-01	3395
2000-01-01	3434.848
2000-04-01	3491.987
2000-07-01	3537.378
2000-10-01	3563.385
2001-01-01	3570.246
2001-04-01	3588.775
2001-07-01	3601.748
2001-10-01	3626.770
2002-01-01	3659.689
2002-04-01	3665.017
2002-07-01	3710.204
2002-10-01	3729.498
2003-01-01	3732.187
2003-04-01	3724.536
2003-07-01	3736.058
2003-10-01	3730.152
2004-01-01	3756.647
2004-04-01	3773.065
2004-07-01	3779.501
2004-10-01	3792.726
2005-01-01	3793.692
2005-04-01	3820.957
2005-07-01	3830.522
2005-10-01	3842.138
2006-01-01	3858.663
2006-04-01	3863.044
2006-07-01	3876.244
2006-10-01	3913.151
2007-01-01	3946.307
2007-04-01	3981.253
2007-07-01	3986.060
2007-10-01	3992.685
2008-01-01	4006.082
2008-04-01	4025.910
2008-07-01	4054.594
2008-10-01	4064.509
2009-01-01	4109.462
2009-04-01	4081.747
2009-07-01	4086.071
2009-10-01	4078.558
2010-01-01	4006.892
2010-04-01	4033.427
2010-07-01	4032.559
2010-10-01	4029.186
2011-01-01	4031.668
2011-04-01	4040.034
2011-07-01	4043.595
2011-10-01	4075.859