Quarter	Percent
1976-06-30	10.9
1976-09-30	11.6
1976-12-31	11.4
1977-03-31	9.7
1977-06-30	10.8
1977-09-30	11.2
1977-12-31	14
1978-03-31	16.4
1978-06-30	16
1978-09-30	15.9
1978-12-31	15.1
1979-03-31	15.5
1979-06-30	16.1
1979-09-30	17.4
1979-12-31	18.5
1980-03-31	18
1980-06-30	19.1
1980-09-30	17.9
1980-12-31	17.9
1981-03-31	18.3
1981-06-30	15.2
1981-09-30	14.2
1981-12-31	11.2
1982-03-31	9.9
1982-06-30	11.3
1982-09-30	11.6
1982-12-31	13.2
1983-03-31	14.6
1983-06-30	13
1983-09-30	12.1
1983-12-31	11.4
1984-03-31	10.6
1984-06-30	11.8
1984-09-30	11.6
1984-12-31	12
1985-03-31	11.7
1985-06-30	11.6
1985-09-30	11.9
1985-12-31	12.1
1986-03-31	13.6
1986-06-30	13.2
1986-09-30	11.3
1986-12-31	10.9
1987-03-31	8.7
1987-06-30	9.1
1987-09-30	10.4
1987-12-31	10.9
1988-03-31	12.3
1988-06-30	13
1988-09-30	16.5
1988-12-31	16.7
1989-03-31	16.8
1989-06-30	16.2
1989-09-30	15.2
1989-12-31	15.2
1990-03-31	14.9
1990-06-30	15.3
1990-09-30	13.9
1990-12-31	12.3
1991-03-31	12.3
1991-06-30	11.1
1991-09-30	9.6
1991-12-31	8.2
1992-03-31	7
1992-06-30	5.9
1992-09-30	5.4
1992-12-31	5.1
1993-03-31	4.1
1993-06-30	3.6
1993-09-30	3.5
1993-12-31	3.3
1994-03-31	3.5
1994-06-30	2.6
1994-09-30	2.6
1994-12-31	2.8
1995-03-31	3.3
1995-06-30	5.1
1995-09-30	6.4
1995-12-31	7.1
1996-03-31	7.3
1996-06-30	6.7
1996-09-30	5.3
1996-12-31	5.7
1997-03-31	6.9
1997-06-30	7.1
1997-09-30	8
1997-12-31	8.5
1998-03-31	6.5
1998-06-30	6.5
1998-09-30	6.2
1998-12-31	6.6
1999-03-31	6.3
1999-06-30	6.8
1999-09-30	6.4
1999-12-31	6.6
2000-03-31	6.1
2000-06-30	5.5
2000-09-30	6.6
2000-12-31	6.4
2001-03-31	7.8
2001-06-30	8.6
2001-09-30	8.6
2001-12-31	8.1
2002-03-31	8.5
2002-06-30	8.6
2002-09-30	7.8
2002-12-31	8.1
2003-03-31	8.2
2003-06-30	8
2003-09-30	8.6
2003-12-31	9.1
2004-03-31	8.6
2004-06-30	8.8
2004-09-30	8.9
2004-12-31	8.6
2005-03-31	8.7
2005-06-30	8.8
2005-09-30	8.5
2005-12-31	8.2
2006-03-31	8.6
2006-06-30	8.3
2006-09-30	8.4
2006-12-31	8.2
2007-03-31	8.1
2007-06-30	8.5
2007-09-30	8.1
2007-12-31	8
2008-03-31	8.3
2008-06-30	7.8
2008-09-30	6.7
2008-12-31	5.3
2009-03-31	3.8
2009-06-30	2.6
2009-09-30	2.5
2009-12-31	2.6
2010-03-31	3.5
2010-06-30	3
2010-09-30	2.5
2010-12-31	2.7
2011-03-31	1.9
2011-06-30	1.6
2011-09-30	2.5
2011-12-31	2.7
2012-03-31	3.5
2012-06-30	4.6
2012-09-30	5.1
2012-12-31	4.9
2013-03-31	5.1
2013-06-30	4.9
2013-09-30	4.1
2013-12-31	4
2014-03-31	3.5
2014-06-30	3.4
2014-09-30	3.7
2014-12-31	4.1
2015-03-31	3.1
2015-06-30	3.2
2015-09-30	3.3
2015-12-31	3.7
2016-03-31	5.2
2016-06-30	6.1
2016-09-30	6.8
2016-12-31	5.9
2017-03-31	4.8
2017-06-30	3.8
2017-09-30	3
2017-12-31	2.8
2018-03-31	2.9
2018-06-30	2.8
2018-09-30	2.8
2018-12-31	2.9
2019-03-31	3.2
2019-06-30	3.9
2019-09-30	3.9
2019-12-31	4
2020-03-31	4.7
2020-06-30	7
2020-09-30	7.1
2020-12-31	9.8
2021-03-31	11.6
2021-06-30	9.9
2021-09-30	10
2021-12-31	7.4
2022-03-31	4.8
2022-06-30	3.8
2022-09-30	4.3
2022-12-31	4.3
2023-03-31	3.3
2023-06-30	2.5
2023-09-30	1.3
2023-12-31	1.4