Quarter	Percent of Capacity, Seasonally Adjusted
1976-01-01	80.3
1976-04-01	81.8
1976-07-01	82.9
1976-10-01	83.7
1977-01-01	83.9
1977-04-01	84.1
1977-07-01	84.2
1977-10-01	83.6
1978-01-01	83.9
1978-04-01	83.7
1978-07-01	84
1978-10-01	84.2
1979-01-01	84.3
1979-04-01	84.6
1979-07-01	84.6
1979-10-01	85.4
1980-01-01	86.2
1980-04-01	85.7
1980-07-01	85
1980-10-01	84.2
1981-01-01	83.1
1981-04-01	82.7
1981-07-01	82.8
1981-10-01	82.7
1982-01-01	82.1
1982-04-01	82.5
1982-07-01	82.9
1982-10-01	82.9
1983-01-01	83.4
1983-04-01	83.2
1983-07-01	82.5
1983-10-01	82.6
1984-01-01	82.8
1984-04-01	82.8
1984-07-01	83.1
1984-10-01	83.3
1985-01-01	82.5
1985-04-01	82.2
1985-07-01	83.1
1985-10-01	83.2
1986-01-01	83.4
1986-04-01	83.7
1986-07-01	83.3
1986-10-01	83
1987-01-01	83
1987-04-01	83.2
1987-07-01	83.5
1987-10-01	84.3
1988-01-01	85
1988-04-01	85.7
1988-07-01	85.8
1988-10-01	86.4
1989-01-01	87.1
1989-04-01	87.7
1989-07-01	88.2
1989-10-01	88.3
1990-01-01	88.8
1990-04-01	88.7
1990-07-01	88.7
1990-10-01	88.6
1991-01-01	85.5
1991-04-01	84.0
1991-07-01	83.3
1991-10-01	84.4
1992-01-01	82.8
1992-04-01	83.1
1992-07-01	83.1
1992-10-01	82.0
1993-01-01	81.5
1993-04-01	81.4
1993-07-01	80.2
1993-10-01	79.6
1994-01-01	80.4
1994-04-01	80.5
1994-07-01	82.0
1994-10-01	82.4
1995-01-01	82.7
1995-04-01	83.2
1995-07-01	83.4
1995-10-01	83.2
1996-01-01	82.9
1996-04-01	83.0
1996-07-01	82.2
1996-10-01	79.9
1997-01-01	82.1
1997-04-01	82.1
1997-07-01	82.6
1997-10-01	83.2
1998-01-01	84.1
1998-04-01	84.1
1998-07-01	85.3
1998-10-01	85.2
1999-01-01	84.9
1999-04-01	84.7
1999-07-01	83.9
1999-10-01	85.4
2000-01-01	84.8
2000-04-01	86.2
2000-07-01	86.6
2000-10-01	87.3
2001-01-01	87.5
2001-04-01	86.8
2001-07-01	85.3
2001-10-01	85.2
2002-01-01	84.9
2002-04-01	85.7
2002-07-01	85.0
2002-10-01	84.8
2003-01-01	85.2
2003-04-01	84.8
2003-07-01	84.8
2003-10-01	84.0
2004-01-01	83.8
2004-04-01	83
2004-07-01	83.7
2004-10-01	83.9
2005-01-01	83.5
2005-04-01	83.7
2005-07-01	83.7
2005-10-01	83.1
2006-01-01	83.8
2006-04-01	84.8
2006-07-01	85.8
2006-10-01	86.6
2007-01-01	86.4
2007-04-01	86.8
2007-07-01	86.9
2007-10-01	87.7
2008-01-01	87.3
2008-04-01	86.2
2008-07-01	85.6
2008-10-01	83.9
2009-01-01	77.3
2009-04-01	72.6
2009-07-01	72.3
2009-10-01	75
2010-01-01	75.8
2010-04-01	78.7
2010-07-01	79.1
2010-10-01	79.3
2011-01-01	82.2
2011-04-01	84.8
2011-07-01	83.3
2011-10-01	83.2
2012-01-01	82.8
2012-04-01	83.5
2012-07-01	82.2
2012-10-01	80.5
2013-01-01	82.1
2013-04-01	80.6
2013-07-01	80.8
2013-10-01	79.8
2014-01-01	81.7
2014-04-01	81.3
2014-07-01	82.5
2014-10-01	82
2015-01-01	81.9
2015-04-01	82.7
2015-07-01	82.9
2015-10-01	83.4
2016-01-01	82.6
2016-04-01	82.8
2016-07-01	83.8
2016-10-01	83.6
2017-01-01	84.6
2017-04-01	84.3
2017-07-01	84.7
2017-10-01	85.2
2018-01-01	86.2
2018-04-01	85.9
2018-07-01	85.9
2018-10-01	85.9