Quarter	Thousands of Persons, Seasonally Adjusted
1989-01-01	17480.65
1989-04-01	18119.72
1989-07-01	18189.64
1989-10-01	18273.83
1990-01-01	18145.25
1990-04-01	18546.14
1990-07-01	18695.74
1990-10-01	18752.75
1991-01-01	18812.32
1991-04-01	19025.98
1991-07-01	19208.26
1991-10-01	19390.98
1992-01-01	19416.20
1992-04-01	19474.90
1992-07-01	19525.79
1992-10-01	19588.16
1993-01-01	19531.10
1993-04-01	19712.81
1993-07-01	19913.45
1993-10-01	20072.11
1994-01-01	20300.67
1994-04-01	20261.10
1994-07-01	20390.31
1994-10-01	20472.47
1995-01-01	20710.75
1995-04-01	20726.87
1995-07-01	20907.33
1995-10-01	21038.25
1996-01-01	21043.27
1996-04-01	21167.58
1996-07-01	21352.31
1996-10-01	21585.44
1997-01-01	21810.04
1997-04-01	21787.40
1997-07-01	21750.39
1997-10-01	21777.02
1998-01-01	21419.29
1998-04-01	21449.23
1998-07-01	21393.27
1998-10-01	21448.90
1999-01-01	21398.78
1999-04-01	21637.16
1999-07-01	21887.33
1999-10-01	22084.00
2000-01-01	21992.67
2000-04-01	22015.67
2000-07-01	22219.33
2000-10-01	22291.33
2001-01-01	22190.00
2001-04-01	22448.67
2001-07-01	22532.00
2001-10-01	22690.33
2002-01-01	22870.33
2002-04-01	22896.33
2002-07-01	22934.33
2002-10-01	22973.33
2003-01-01	22935.23
2003-04-01	22834.27
2003-07-01	22936.90
2003-10-01	23137.23
2004-01-01	23487.63
2004-04-01	23308.27
2004-07-01	23324.70
2004-10-01	23559.50
2005-01-01	23672.20
2005-04-01	23724.83
2005-07-01	23733.23
2005-10-01	23835.77
2006-01-01	23962.60
2006-04-01	23932.73
2006-07-01	23953.17
2006-10-01	24064.13
2007-01-01	24179.70
2007-04-01	24185.87
2007-07-01	24201.13
2007-10-01	24294.57
2008-01-01	24354.27
2008-04-01	24325.23
2008-07-01	24337.23
2008-10-01	24370.67
2009-01-01	24310.03
2009-04-01	24364.17
2009-07-01	24474.53
2009-10-01	24431.13
2010-01-01	24655.20
2010-04-01	24710.00
2010-07-01	24824.57
2010-10-01	24779.97
2011-01-01	24996.80
2011-04-01	25100.13
2011-07-01	25090.30
2011-10-01	25184.70
2012-01-01	25403.53