Month	Percent
1987-11-01	41.300
1987-12-01	41.300
1988-01-01	41.300
1988-02-01	36.600
1988-03-01	35.100
1988-04-01	35.100
1988-05-01	35.100
1988-06-01	40.300
1988-07-01	43.100
1988-08-01	37.300
1988-09-01	25.400
1988-10-01	16.500
1988-11-01	15.300
1988-12-01	11.200
1989-01-01	11.200
1989-02-01	14.700
1989-03-01	26.700
1989-04-01	30.100
1989-05-01	30.100
1989-06-01	33.700
1989-07-01	33.700
1989-08-01	30.800
1989-09-01	29.500
1989-10-01	29.500
1989-11-01	32.300
1989-12-01	32.300
1990-01-01	25.400
1990-02-01	20.200
1990-03-01	17.100
1990-04-01	14.100
1990-05-01	14.100
1990-06-01	14.100
1990-07-01	14.100
1990-08-01	14.100
1990-09-01	11.200
1990-10-01	11.200
1990-11-01	11.200
1990-12-01	11.200
1991-01-01	11.800
1991-02-01	11.800
1991-03-01	11.800
1991-04-01	11.800
1991-05-01	15.900
1991-06-01	19.000
1991-07-01	15.900
1991-08-01	15.900
1991-09-01	17.100
1991-10-01	16.500
1991-11-01	14.700
1991-12-01	13.500
1992-01-01	13.500
1992-02-01	12.400
1992-03-01	12.400
1992-04-01	10.100
1992-05-01	10.100
1992-06-01	9.800
1992-07-01	9.800
1992-08-01	9.800
1992-09-01	8.700
1992-10-01	8.100
1992-11-01	9.410
1992-12-01	11.860
1993-01-01	11.500
1993-02-01	11.000
1993-03-01	10.100
1993-04-01	9.000
1993-05-01	8.900
1993-06-01	8.700
1993-07-01	9.400
1993-08-01	8.100
1993-09-01	8.900
1993-10-01	8.100
1993-11-01	6.300
1993-12-01	5.400
1994-01-01	5.200
1994-02-01	5.100
1994-03-01	4.400
1994-04-01	4.500
1994-05-01	4.500
1994-06-01	4.600
1994-07-01	4.700
1994-08-01	4.900
1994-09-01	4.900
1994-10-01	5.100
1994-11-01	5.300
1994-12-01	5.500
1995-01-01	6.350
1995-02-01	6.700
1995-03-01	6.900
1995-04-01	7.100
1995-05-01	7.100
1995-06-01	7.100
1995-07-01	6.900
1995-08-01	7.000
1995-09-01	7.500
1995-10-01	7.000
1995-11-01	7.100
1995-12-01	7.300
1996-01-01	7.600
1996-02-01	7.600
1996-03-01	7.500
1996-04-01	6.700
1996-05-01	6.500
1996-06-01	6.500
1996-07-01	6.500
1996-08-01	6.600
1996-09-01	7.100
1996-10-01	7.100
1996-11-01	7.100
1996-12-01	7.100
1997-01-01	7.100
1997-02-01	7.100
1997-03-01	7.200
1997-04-01	7.100
1997-05-01	7.000
1997-06-01	7.000
1997-07-01	7.100
1997-08-01	6.900
1997-09-01	6.900
1997-10-01	6.900
1997-11-01	7.300
1997-12-01	7.200
1998-01-01	7.300
1998-02-01	7.400
1998-03-01	7.300
1998-04-01	7.300
1998-05-01	7.300
1998-06-01	7.300
1998-07-01	7.300
1998-08-01	7.207
1998-09-01	7.494
1998-10-01	7.593
1998-11-01	7.829
1998-12-01	8.171
1999-01-01	7.841
1999-02-01	7.983
1999-03-01	8.743
1999-04-01	8.782
1999-05-01	8.615
1999-06-01	8.909
1999-07-01	9.131
1999-08-01	9.145
1999-09-01	9.620
1999-10-01	10.637
1999-11-01	11.155
1999-12-01	11.447
2000-01-01	10.331
2000-02-01	10.642
2000-03-01	10.708
2000-04-01	10.776
2000-05-01	10.961
2000-06-01	11.240
2000-07-01	11.744
2000-08-01	11.842
2000-09-01	11.276
2000-10-01	11.288
2000-11-01	11.783
2000-12-01	11.956
2001-01-01	11.693
2001-02-01	11.692
2001-03-01	11.743
2001-04-01	12.241
2001-05-01	12.246
2001-06-01	12.289
2001-07-01	12.387
2001-08-01	11.961
2001-09-01	11.695
2001-10-01	11.864
2001-11-01	11.583
2001-12-01	12.456
2002-01-01	12.568
2002-02-01	12.289
2002-03-01	11.472
2002-04-01	10.315
2002-05-01	9.596
2002-06-01	8.974
2002-07-01	8.399
2002-08-01	7.750
2002-09-01	7.214
2002-10-01	6.646
2002-11-01	6.350
2002-12-01	6.119
2003-01-01	6.284
2003-02-01	5.661
2003-03-01	5.394
2003-04-01	5.272
2003-05-01	5.270
2003-06-01	5.270
2003-07-01	5.271
2003-08-01	5.245
2003-09-01	5.232
2003-10-01	5.095
2003-11-01	5.101
2003-12-01	5.104
2004-01-01	5.191
2004-02-01	5.167
2004-03-01	5.327
2004-04-01	5.373
2004-05-01	5.616
2004-06-01	6.113
2004-07-01	6.467
2004-08-01	6.473
2004-09-01	6.698
2004-10-01	7.030
2004-11-01	7.534
2004-12-01	8.472
2005-01-01	8.561
2005-02-01	8.691
2005-03-01	9.072
2005-04-01	9.198
2005-05-01	9.200
2005-06-01	9.286
2005-07-01	9.300
2005-08-01	9.300
2005-09-01	9.441
2005-10-01	10.038
2005-11-01	10.106
2005-12-01	10.112
2006-01-01	10.190
2006-02-01	10.333
2006-03-01	10.616
2006-04-01	11.474
2006-05-01	11.782
2006-06-01	12.266
2006-07-01	12.582
2006-08-01	13.009
2006-09-01	13.369
2006-10-01	13.860
2006-11-01	14.168
2006-12-01	14.601
2007-01-01	15.145
2007-02-01	15.183
2007-03-01	14.287
2007-04-01	13.933
2007-05-01	13.949
2007-06-01	13.887
2007-07-01	14.125
2007-08-01	14.250
2007-09-01	14.246
2007-10-01	13.947
2007-11-01	14.254
2007-12-01	14.282
2008-01-01	14.059
2008-02-01	13.717
2008-03-01	14.272
2008-04-01	15.600
2008-05-01	15.880
2008-06-01	15.950
2008-07-01	16.058
2008-08-01	16.100
2008-09-01	16.100
2008-10-01	15.170
2008-11-01	18.570
2008-12-01	18.410
2009-01-01	18.410
2009-02-01	18.300
2009-03-01	17.170
2009-04-01	14.540
2009-05-01	8.790
2009-06-01	7.940
2009-07-01	8.120
2009-08-01	7.980
2009-09-01	8.400
2009-10-01	8.490
2009-11-01	8.700
2009-12-01	8.540
2010-01-01	8.380
2010-02-01	8.250
2010-03-01	8.130
2010-04-01	8.000
2010-05-01	7.550
2010-06-01	7.350
2010-07-01	7.050
2010-08-01	6.600
2010-09-01	5.710
2010-10-01	5.300
2010-11-01	4.850
2010-12-01	4.300
2011-01-01	4.120
2011-02-01	4.000
2011-03-01	4.000
2011-04-01	4.000
2011-05-01	4.000
2011-06-01	4.000
2011-07-01	4.000
2011-08-01	4.270
2011-09-01	4.560
2011-10-01	4.600
2011-11-01	4.730
2011-12-01	4.800
2012-01-01	4.800
2012-02-01	4.800
2012-03-01	4.870
2012-04-01	5.100
2012-05-01	5.400
2012-06-01	5.660
2012-07-01	5.750
2012-08-01	5.750
2012-09-01	5.750
2012-10-01	6.040
2012-11-01	6.100
2012-12-01	6.140
2013-01-01	6.150
2013-02-01	6.150
2013-03-01	6.160
2013-04-01	6.200
2013-05-01	6.200
2013-06-01	6.200
2013-07-01	6.200
2013-08-01	6.200
2013-09-01	6.200
2013-10-01	6.200
2013-11-01	6.200
2013-12-01	6.200
2014-01-01	6.200
2014-02-01	6.200
2014-03-01	6.170
2014-04-01	6.090
2014-05-01	6.020
2014-06-01	6.080
2014-07-01	6.100
2014-08-01	6.100
2014-09-01	6.100
2014-10-01	6.100
2014-11-01	5.910
2014-12-01	5.560
2015-01-01	5.400
2015-02-01	5.370
2015-03-01	5.350
2015-04-01	5.350
2015-05-01	5.370
2015-06-01	5.770
2015-07-01	5.950
2015-08-01	6.160
2015-09-01	6.400
2015-10-01	6.400
2015-11-01	6.580
2015-12-01	6.600
2016-01-01	6.550
2016-02-01	6.550
2016-03-01	6.550
2016-04-01	6.550
2016-05-01	6.550
2016-06-01	6.550
2016-07-01	6.550
2016-08-01	6.050
2016-09-01	5.950
2016-10-01	6.050
2016-11-01	5.850
2016-12-01	5.600
2017-01-01	5.500
2017-02-01	5.500
2017-03-01	5.500
2017-04-01	5.480
2017-05-01	5.230
2017-06-01	4.900
2017-07-01	4.900
2017-08-01	4.900
2017-09-01	4.900
2017-10-01	4.650
2017-11-01	4.650
2017-12-01	4.650
2018-01-01	4.650
2018-02-01	4.650
2018-03-01	4.650
2018-04-01	4.680
2018-05-01	4.680
2018-06-01	4.700
2018-07-01	4.700
2018-08-01	4.700
2018-09-01	4.700
2018-10-01	4.700