Month	Percent
1991-01-01	17.300
1991-02-01	16.900
1991-03-01	17.600
1991-04-01	18.650
1991-05-01	19.010
1991-06-01	19.020
1991-07-01	18.300
1991-08-01	18.540
1991-09-01	19.010
1991-10-01	18.890
1991-11-01	18.010
1991-12-01	18.380
1992-01-01	17.190
1992-02-01	16.420
1992-03-01	16.900
1992-04-01	17.280
1992-05-01	17.540
1992-06-01	17.310
1992-07-01	16.730
1992-08-01	17.160
1992-09-01	17.210
1992-10-01	14.250
1992-11-01	13.770
1992-12-01	15.190
1993-01-01	13.860
1993-02-01	12.510
1993-03-01	11.740
1993-04-01	11.460
1993-05-01	11.530
1993-06-01	12.550
1993-07-01	13.250
1993-08-01	14.870
1993-09-01	14.710
1993-10-01	13.890
1993-11-01	12.900
1993-12-01	12.270
1994-01-01	11.680
1994-02-01	11.600
1994-03-01	12.720
1994-04-01	12.470
1994-05-01	12.380
1994-06-01	12.490
1994-07-01	12.830
1994-08-01	15.000
1994-09-01	15.040
1994-10-01	14.390
1994-11-01	14.000
1994-12-01	14.850
1995-01-01	15.720
1995-02-01	16.650
1995-03-01	15.330
1995-04-01	14.560
1995-05-01	14.870
1995-06-01	14.730
1995-07-01	14.240
1995-08-01	13.450
1995-09-01	13.100
1995-10-01	12.320
1995-11-01	11.950
1995-12-01	11.730
1996-01-01	11.650
1996-02-01	11.670
1996-03-01	11.550
1996-04-01	10.460
1996-05-01	10.870
1996-06-01	12.180
1996-07-01	12.840
1996-08-01	14.790
1996-09-01	14.300
1996-10-01	14.110
1996-11-01	13.660
1996-12-01	13.530
1997-01-01	12.660
1997-02-01	12.280
1997-03-01	13.230
1997-04-01	13.110
1997-05-01	12.750
1997-06-01	11.790
1997-07-01	11.910
1997-08-01	12.650
1997-09-01	13.390
1997-10-01	13.790
1997-11-01	14.470
1997-12-01	18.550
1998-01-01	23.100
1998-02-01	22.460
1998-03-01	22.610
1998-04-01	20.260
1998-05-01	18.280
1998-06-01	16.930
1998-07-01	13.950
1998-08-01	11.190
1998-09-01	10.380
1998-10-01	8.080
1998-11-01	7.700
1998-12-01	7.700
1999-01-01	7.000
1999-02-01	6.700
1999-03-01	6.560
1999-04-01	6.160
1999-05-01	6.170
1999-06-01	6.280
1999-07-01	6.750
1999-08-01	7.190
1999-09-01	7.540
1999-10-01	7.290
1999-11-01	6.910
1999-12-01	7.160
2000-01-01	7.280
2000-02-01	7.130
2000-03-01	7.000
2000-04-01	7.060
2000-05-01	7.140
2000-06-01	7.170
2000-07-01	7.150
2000-08-01	7.040
2000-09-01	7.050
2000-10-01	7.040
2000-11-01	6.990
2000-12-01	6.890
2001-01-01	6.430
2001-02-01	5.730
2001-03-01	5.680
2001-04-01	5.840
2001-05-01	5.850
2001-06-01	5.650
2001-07-01	5.320
2001-08-01	4.920
2001-09-01	4.660
2001-10-01	4.360
2001-11-01	4.530
2001-12-01	4.840
2002-01-01	4.790
2002-02-01	4.540
2002-03-01	4.640
2002-04-01	4.790
2002-05-01	4.810
2002-06-01	4.850
2002-07-01	4.910
2002-08-01	4.800
2002-09-01	4.810
2002-10-01	4.910
2002-11-01	4.910
2002-12-01	4.900
2003-01-01	4.700
2003-02-01	4.540
2003-03-01	4.760
2003-04-01	4.620
2003-05-01	4.390
2003-06-01	4.280
2003-07-01	4.150
2003-08-01	3.900
2003-09-01	3.830
2003-10-01	3.930
2003-11-01	4.230
2003-12-01	4.340
2004-01-01	4.260
2004-02-01	4.080
2004-03-01	3.930
2004-04-01	3.910
2004-05-01	3.900
2004-06-01	3.910
2004-07-01	3.910
2004-08-01	3.700
2004-09-01	3.520
2004-10-01	3.520
2004-11-01	3.420
2004-12-01	3.390
2005-01-01	3.470
2005-02-01	3.590
2005-03-01	3.550
2005-04-01	3.520
2005-05-01	3.510
2005-06-01	3.510
2005-07-01	3.510
2005-08-01	3.500
2005-09-01	3.700
2005-10-01	3.930
2005-11-01	3.960
2005-12-01	4.040
2006-01-01	4.150
2006-02-01	4.250
2006-03-01	4.270
2006-04-01	4.330
2006-05-01	4.360
2006-06-01	4.470
2006-07-01	4.630
2006-08-01	4.680
2006-09-01	4.640
2006-10-01	4.570
2006-11-01	4.600
2006-12-01	4.760
2007-01-01	4.920
2007-02-01	4.950
2007-03-01	4.940
2007-04-01	4.950
2007-05-01	5.040
2007-06-01	5.030
2007-07-01	5.050
2007-08-01	5.210
2007-09-01	5.340
2007-10-01	5.340
2007-11-01	5.430
2007-12-01	5.730
2008-01-01	5.810
2008-02-01	5.280
2008-03-01	5.250
2008-04-01	5.380
2008-05-01	5.360
2008-06-01	5.360
2008-07-01	5.520
2008-08-01	5.770
2008-09-01	5.790
2008-10-01	6.030
2008-11-01	5.620
2008-12-01	4.680
2009-01-01	3.220
2009-02-01	2.700
2009-03-01	2.450
2009-04-01	2.420
2009-05-01	2.410
2009-06-01	2.410
2009-07-01	2.410
2009-08-01	2.480
2009-09-01	2.640
2009-10-01	2.790
2009-11-01	2.790
2009-12-01	2.820
2010-01-01	2.880
2010-02-01	2.880
2010-03-01	2.830
2010-04-01	2.510
2010-05-01	2.450
2010-06-01	2.450
2010-07-01	2.580
2010-08-01	2.630
2010-09-01	2.660
2010-10-01	2.660
2010-11-01	2.730
2010-12-01	2.800
2011-01-01	2.930
2011-02-01	3.130
2011-03-01	3.350
2011-04-01	3.400
2011-05-01	3.460
2011-06-01	3.530
2011-07-01	3.590
2011-08-01	3.590
2011-09-01	3.580
2011-10-01	3.580
2011-11-01	3.560
2011-12-01	3.550
2012-01-01	3.550
2012-02-01	3.530
2012-03-01	3.540
2012-04-01	3.540
2012-05-01	3.540
2012-06-01	3.540
2012-07-01	3.340
2012-08-01	3.190
2012-09-01	3.140
2012-10-01	2.930
2012-11-01	2.850
2012-12-01	2.880
2013-01-01	2.860
2013-02-01	2.830
2013-03-01	2.810
2013-04-01	2.800
2013-05-01	2.720
2013-06-01	2.690
2013-07-01	2.680
2013-08-01	2.660
2013-09-01	2.660
2013-10-01	2.660
2013-11-01	2.650
2013-12-01	2.650
2014-01-01	2.650
2014-02-01	2.650
2014-03-01	2.650
2014-04-01	2.650
2014-05-01	2.650
2014-06-01	2.650
2014-07-01	2.650
2014-08-01	2.517
2014-09-01	2.350
2014-10-01	2.210
2014-11-01	2.140
2014-12-01	2.130
2015-01-01	2.130
2015-02-01	2.120
2015-03-01	1.950
2015-04-01	1.810
2015-05-01	1.800
2015-06-01	1.700
2015-07-01	1.650
2015-08-01	1.640
2015-09-01	1.600
2015-10-01	1.580
2015-11-01	1.590
2015-12-01	1.670
2016-01-01	1.670
2016-02-01	1.640
2016-03-01	1.630
2016-04-01	1.610
2016-05-01	1.580
2016-06-01	1.430
2016-07-01	1.360
2016-08-01	1.350
2016-09-01	1.340
2016-10-01	1.350
2016-11-01	1.420
2016-12-01	1.540
2017-01-01	1.500
2017-02-01	1.490
2017-03-01	1.480
2017-04-01	1.430
2017-05-01	1.390
2017-06-01	1.380
2017-07-01	1.390
2017-08-01	1.390
2017-09-01	1.380
2017-10-01	1.380
2017-11-01	1.450
2017-12-01	1.660
2018-01-01	1.660
2018-02-01	1.650
2018-03-01	1.650
2018-04-01	1.650
2018-05-01	1.650
2018-06-01	1.650
2018-07-01	1.650
2018-08-01	1.650
2018-09-01	1.650
2018-10-01	1.680