Month	Percent
1986-04-01	42.1
1986-05-01	41.9
1986-06-01	40.9
1986-07-01	39.2
1986-08-01	38.2
1986-09-01	38.5
1986-10-01	39
1986-11-01	39.5
1986-12-01	39.3
1987-01-01	39.7
1987-02-01	39
1987-03-01	37.8
1987-04-01	36.8
1987-05-01	35.4
1987-06-01	34.6
1987-07-01	33.8
1987-08-01	33.5
1987-09-01	33.6
1987-10-01	33.8
1987-11-01	33.4
1987-12-01	33.4
1988-01-01	33.8
1988-02-01	33.4
1988-03-01	32.9
1988-04-01	33.2
1988-05-01	32.5
1988-06-01	32.1
1988-07-01	30.6
1988-08-01	30
1988-09-01	29.6
1988-10-01	29.3
1988-11-01	29
1988-12-01	28.4
1989-01-01	28.8
1989-02-01	28.2
1989-03-01	27.4
1989-04-01	26.8
1989-05-01	25.1
1989-06-01	24.6
1989-07-01	24
1989-08-01	24.3
1989-09-01	24
1989-10-01	25.4
1989-11-01	26
1989-12-01	26.7
1990-01-01	26.1
1990-02-01	26.1
1990-03-01	25.1
1990-04-01	24.6
1990-05-01	23.8
1990-06-01	24
1990-07-01	23.5
1990-08-01	23.9
1990-09-01	23.8
1990-10-01	24.3
1990-11-01	23.8
1990-12-01	24.2
1991-01-01	24.3
1991-02-01	24.5
1991-03-01	24.3
1991-04-01	24
1991-05-01	23.1
1991-06-01	23.2
1991-07-01	22.7
1991-08-01	22.7
1991-09-01	23
1991-10-01	24.5
1991-11-01	24.1
1991-12-01	24.2
1992-01-01	24.8
1992-02-01	24.9
1992-03-01	25.5
1992-04-01	26.1
1992-05-01	25.7
1992-06-01	26.5
1992-07-01	26.7
1992-08-01	26.9
1992-09-01	28.6
1992-10-01	30.5
1992-11-01	31.6
1992-12-01	32.8
1993-01-01	34.2
1993-02-01	35.1
1993-03-01	36.5
1993-04-01	36.7
1993-05-01	36.2
1993-06-01	37.4
1993-07-01	37.4
1993-08-01	37.2
1993-09-01	38.6
1993-10-01	39.3
1993-11-01	39.7
1993-12-01	39.9
1994-01-01	41
1994-02-01	41.1
1994-03-01	40.5
1994-04-01	39.6
1994-05-01	38.7
1994-06-01	38.3
1994-07-01	36.9
1994-08-01	36.6
1994-09-01	36.9
1994-10-01	36.4
1994-11-01	36.8
1994-12-01	36.6
1995-01-01	35.5
1995-02-01	36.1
1995-03-01	35.6
1995-04-01	34.4
1995-05-01	33.9
1995-06-01	33.9
1995-07-01	33
1995-08-01	33.1
1995-09-01	34.1
1995-10-01	33.9
1995-11-01	34.6
1995-12-01	33.8
1996-01-01	34.7
1996-02-01	35.2
1996-03-01	35
1996-04-01	34.3
1996-05-01	34
1996-06-01	33.8
1996-07-01	32.5
1996-08-01	32.4
1996-09-01	33.4
1996-10-01	33.2
1996-11-01	33.9
1996-12-01	32.8
1997-01-01	33
1997-02-01	33.1
1997-03-01	32.1
1997-04-01	31.4
1997-05-01	31
1997-06-01	31
1997-07-01	29.7
1997-08-01	29.4
1997-09-01	30
1997-10-01	29.4
1997-11-01	29.4
1997-12-01	28.7
1998-01-01	29.1
1998-02-01	28.6
1998-03-01	28.1
1998-04-01	27.1
1998-05-01	26.6
1998-06-01	26.8
1998-07-01	25.6
1998-08-01	26
1998-09-01	25.7
1998-10-01	25.1
1998-11-01	25
1998-12-01	24.2
1999-01-01	24.3
1999-02-01	23.6
1999-03-01	22.7
1999-04-01	21.2
1999-05-01	20.3
1999-06-01	20.3
1999-07-01	19.1
1999-08-01	19.7
1999-09-01	19.7
1999-10-01	19.6
1999-11-01	20.1
1999-12-01	19.5
2000-01-01	20.4
2000-02-01	19.5
2000-03-01	18.6
2000-04-01	17.5
2000-05-01	17.2
2000-06-01	17.6
2000-07-01	17.4
2000-08-01	18.3
2000-09-01	18.2
2000-10-01	18.4
2000-11-01	18.3
2000-12-01	17.1
2001-01-01	16.6
2001-02-01	17.7
2001-03-01	17.1
2001-04-01	16.1
2001-05-01	16.6
2001-06-01	16.5
2001-07-01	15.8
2001-08-01	16.5
2001-09-01	16.6
2001-10-01	16.8
2001-11-01	16.9
2001-12-01	16.8
2002-01-01	18.1
2002-02-01	19.3
2002-03-01	17.8
2002-04-01	16.9
2002-05-01	16.4
2002-06-01	17.2
2002-07-01	17.8
2002-08-01	18.7
2002-09-01	19.6
2002-10-01	20.1
2002-11-01	20.3
2002-12-01	20
2003-01-01	20.4
2003-02-01	20.2
2003-03-01	19.9
2003-04-01	19.4
2003-05-01	18.7
2003-06-01	19.4
2003-07-01	18.9
2003-08-01	19
2003-09-01	19.4
2003-10-01	19.7
2003-11-01	19.7
2003-12-01	19.5
2004-01-01	19.6
2004-02-01	19.4
2004-03-01	19.2
2004-04-01	19.8
2004-05-01	19.2
2004-06-01	19.4
2004-07-01	18.4
2004-08-01	18.4
2004-09-01	18.5
2004-10-01	17.9
2004-11-01	17.8
2004-12-01	17.5
2005-01-01	18.3
2005-02-01	18.6
2005-03-01	18.7
2005-04-01	18.2
2005-05-01	17.2
2005-06-01	16.6
2005-07-01	15.1
2005-08-01	14.7
2005-09-01	15.1
2005-10-01	15.7
2005-11-01	16.2
2005-12-01	16.2
2006-01-01	16.7
2006-02-01	16.7
2006-03-01	16.8
2006-04-01	16.1
2006-05-01	15.2
2006-06-01	14.6
2006-07-01	13.8
2006-08-01	13.9
2006-09-01	14
2006-10-01	14.2
2006-11-01	14.3
2006-12-01	13.8
2007-01-01	13.9
2007-02-01	14
2007-03-01	14.4
2007-04-01	15
2007-05-01	14.9
2007-06-01	15.4
2007-07-01	14.8
2007-08-01	15.2
2007-09-01	15.6
2007-10-01	15.8
2007-11-01	16.6
2007-12-01	17.2
2008-01-01	18.6
2008-02-01	19.4
2008-03-01	20
2008-04-01	21.3
2008-05-01	21.9
2008-06-01	22.6
2008-07-01	22.4
2008-08-01	23.3
2008-09-01	25.3
2008-10-01	27.7
2008-11-01	29.9
2008-12-01	31.2
2009-01-01	33.7
2009-02-01	36.3
2009-03-01	38.6
2009-04-01	40
2009-05-01	40.3
2009-06-01	39.6
2009-07-01	38.9
2009-08-01	38.9
2009-09-01	40.2
2009-10-01	40.7
2009-11-01	41
2009-12-01	40.8
2010-01-01	42
2010-02-01	43.5
2010-03-01	44.3
2010-04-01	44.2
2010-05-01	43.5
2010-06-01	42.1
2010-07-01	40.8
2010-08-01	40.9
2010-09-01	42.6
2010-10-01	44
2010-11-01	45
2010-12-01	44.4
2011-01-01	45.7
2011-02-01	47.5
2011-03-01	48.9
2011-04-01	48.8
2011-05-01	48.3
2011-06-01	47.2
2011-07-01	46.5
2011-08-01	46.2
2011-09-01	48.3
2011-10-01	49.7
2011-11-01	50.7
2011-12-01	50.3
2012-01-01	52.1
2012-02-01	54.1
2012-03-01	55.1
2012-04-01	55
2012-05-01	54.6
2012-06-01	53.2
2012-07-01	52.4
2012-08-01	52
2012-09-01	53.8
2012-10-01	55.4
2012-11-01	56.2
2012-12-01	56.1
2013-01-01	58.1
2013-02-01	59.6
2013-03-01	59.5
2013-04-01	58
2013-05-01	56.4
2013-06-01	54.6
2013-07-01	53.9
2013-08-01	53.2
2013-09-01	54.8
2013-10-01	55.8
2013-11-01	56.3
2013-12-01	54.5
2014-01-01	55.8
2014-02-01	56.1
2014-03-01	56.2
2014-04-01	54.9
2014-05-01	53.9
2014-06-01	52.5
2014-07-01	52.7
2014-08-01	51.8
2014-09-01	52.5
2014-10-01	52.1
2014-11-01	51.8
2014-12-01	50.7
2015-01-01	51.9
2015-02-01	52.7
2015-03-01	53.0
2015-04-01	51.6
2015-05-01	50.3
2015-06-01	48.2
2015-07-01	47.0
2015-08-01	46.1
2015-09-01	46.8
2015-10-01	46.6
2015-11-01	45.5
2015-12-01	43.9
2016-01-01	44.3
2016-02-01	46.0
2016-03-01	46.7
2016-04-01	47.2
2016-05-01	46.2
2016-06-01	44.2
2016-07-01	42.1
2016-08-01	41.1
2016-09-01	42.6
2016-10-01	43.2
2016-11-01	43.7
2016-12-01	41.4
2017-01-01	41.8
2017-02-01	42.7
2017-03-01	43.2
2017-04-01	42.2
2017-05-01	41.0
2017-06-01	38.8
2017-07-01	37.4
2017-08-01	36.5
2017-09-01	38.4
2017-10-01	38.6
2017-11-01	38.1
2017-12-01	36.7
2018-01-01	37.3
2018-02-01	38.4
2018-03-01	38.2
2018-04-01	37.0
2018-05-01	35.6
2018-06-01	34.0
2018-07-01	33.3
2018-08-01	33.3
2018-09-01	35.3