Month	Percent
1997-01-01	34.900
1997-02-01	33.100
1997-03-01	30.600
1997-04-01	28.900
1997-05-01	30.400
1997-06-01	22.800
1997-07-01	30.500
1997-08-01	22.400
1997-09-01	15.800
1997-10-01	19.700
1997-11-01	19.700
1997-12-01	15.700
1998-01-01	25.400
1998-02-01	28.600
1998-03-01	25.800
1998-04-01	26.100
1998-05-01	45.300
1998-06-01	31.500
1998-07-01	39.400
1998-08-01	35.500
1998-09-01	12.100
1998-10-01	33.000
1998-11-01	35.800
1998-12-01	20.000
1999-01-01	43.900
1999-02-01	23.300
1999-03-01	21.600
1999-04-01	20.600
1999-05-01	21.000
1999-06-01	20.400
1999-07-01	16.900
1999-08-01	19.500
1999-09-01	17.700
1999-10-01	19.900
1999-11-01	22.200
1999-12-01	28.600
2000-01-01	27.400
2000-02-01	17.800
2000-03-01	14.700
2000-04-01	13.500
2000-05-01	10.900
2000-06-01	12.200
2000-07-01	9.100
2000-08-01	9.600
2000-09-01	11.400
2000-10-01	9.300
2000-11-01	8.900
2000-12-01	9.100
2001-01-01	8.100
2001-02-01	12.100
2001-03-01	8.500
2001-04-01	10.300
2001-05-01	10.600
2001-06-01	9.000
2001-07-01	10.400
2001-08-01	10.100
2001-09-01	7.500
2001-10-01	9.900
2001-11-01	13.200
2001-12-01	10.100
2002-01-01	14.700
2002-02-01	13.700
2002-03-01	14.200
2002-04-01	13.500
2002-05-01	12.800
2002-06-01	12.300
2002-07-01	13.100
2002-08-01	11.800
2002-09-01	9.600
2002-10-01	10.500
2002-11-01	10.600
2002-12-01	11.900
2003-01-01	10.400
2003-02-01	8.800
2003-03-01	7.200
2003-04-01	6.700
2003-05-01	5.600
2003-06-01	7.300
2003-07-01	7.000
2003-08-01	7.400
2003-09-01	11.300
2003-10-01	8.800
2003-11-01	9.200
2003-12-01	7.800
2004-01-01	5.100
2004-02-01	6.300
2004-03-01	5.400
2004-04-01	6.700
2004-05-01	9.400
2004-06-01	10.400
2004-07-01	8.700
2004-08-01	7.000
2004-09-01	7.800
2004-10-01	5.800
2004-11-01	7.800
2004-12-01	4.860
2005-01-01	5.620
2005-02-01	5.980
2005-03-01	4.560
2005-04-01	5.610
2005-05-01	5.800
2005-06-01	6.390
2005-07-01	4.970
2005-08-01	5.400
2005-09-01	5.660
2005-10-01	5.560
2005-11-01	7.400
2005-12-01	7.100
2006-01-01	6.300
2006-02-01	5.520
2006-03-01	5.800
2006-04-01	6.510
2006-05-01	5.190
2006-06-01	5.480
2006-07-01	5.570
2006-08-01	5.340
2006-09-01	6.200
2006-10-01	6.560
2006-11-01	6.900
2006-12-01	7.050
2007-01-01	5.710
2007-02-01	6.510
2007-03-01	5.700
2007-04-01	6.170
2007-05-01	6.000
2007-06-01	5.670
2007-07-01	6.260
2007-08-01	6.450
2007-09-01	7.700
2007-10-01	8.040
2007-11-01	8.270
2007-12-01	7.450
2008-01-01	6.040
2008-02-01	8.080
2008-03-01	6.940
2008-04-01	7.990
2008-05-01	8.000
2008-06-01	8.020
2008-07-01	7.730
2008-08-01	8.310
2008-09-01	9.680
2008-10-01	17.170
2008-11-01	18.200
2008-12-01	23.100
2009-01-01	27.830
2009-02-01	20.800
2009-03-01	14.800
2009-04-01	12.830
2009-05-01	11.200
2009-06-01	12.200
2009-07-01	10.400
2009-08-01	9.290
2009-09-01	10.910
2009-10-01	9.540
2009-11-01	8.140
2009-12-01	8.660
2010-01-01	7.170
2010-02-01	7.310
2010-03-01	6.300
2010-04-01	5.300
2010-05-01	4.700
2010-06-01	4.600
2010-07-01	4.200
2010-08-01	4.200
2010-09-01	4.300
2010-10-01	4.490
2010-11-01	4.640
2010-12-01	4.690
2011-01-01	4.633
2011-02-01	4.599
2011-03-01	4.540
2011-04-01	4.780
2011-05-01	4.374
2011-06-01	4.857
2011-07-01	5.840
2011-08-01	5.056
2011-09-01	5.813
2011-10-01	6.932
2011-11-01	7.050
2011-12-01	7.420
2012-01-01	7.569
2012-02-01	7.250
2012-03-01	6.932
2012-04-01	7.300
2012-05-01	7.166
2012-06-01	7.400
2012-07-01	6.895
2012-08-01	7.160
2012-09-01	7.166
2012-10-01	7.509
2012-11-01	7.631
2012-12-01	7.507
2013-01-01	7.300
2013-02-01	7.546
2013-03-01	7.800
2013-04-01	7.300
2013-05-01	7.328
2013-06-01	7.700
2013-07-01	7.700
2013-08-01	7.700
2013-09-01	7.700
2013-10-01	7.186
2013-11-01	7.200
2013-12-01	7.413
2014-01-01	7.235
2014-02-01	7.386
2014-03-01	8.900
2014-04-01	8.460
2014-05-01	9.240
2014-06-01	8.680
2014-07-01	8.730
2014-08-01	8.730
2014-09-01	9.000
2014-10-01	9.230
2014-11-01	10.770
2014-12-01	16.400
2015-01-01	21.910
2015-02-01	17.480
2015-03-01	15.810
2015-04-01	15.250
2015-05-01	13.480
2015-06-01	13.460
2015-07-01	13.350
2015-08-01	13.890
2015-09-01	12.520
2015-10-01	13.840
2015-11-01	13.290
2015-12-01	12.800
2016-01-01	12.680
2016-02-01	12.750
2016-03-01	12.340
2016-04-01	12.150
2016-05-01	12.670
2016-06-01	11.720
2016-07-01	10.790
2016-08-01	11.460
2016-09-01	10.700
2016-10-01	11.090
2016-11-01	10.430
2016-12-01	10.450
2017-01-01	10.320
2017-02-01	10.820
2017-03-01	10.580
2017-04-01	10.510
2017-05-01	8.170
2017-06-01	8.750
2017-07-01	8.720
2017-08-01	8.790
2017-09-01	8.670
2017-10-01	8.280
2017-11-01	8.320
2017-12-01	7.520
2018-01-01	7.200
2018-02-01	7.070
2018-03-01	7.070
2018-04-01	7.220
2018-05-01	6.990
2018-06-01	7.200
2018-07-01	7.100
2018-08-01	7.600
2018-09-01	8.200