Quarter	Percent of Capacity, Seasonally Adjusted
1985-01-01	77.4
1985-04-01	81
1985-07-01	81
1985-10-01	77.9
1986-01-01	86.1
1986-04-01	81.7
1986-07-01	82
1986-10-01	80.6
1987-01-01	76.3
1987-04-01	77.3
1987-07-01	78
1987-10-01	78.4
1988-01-01	82.4
1988-04-01	79.9
1988-07-01	82.4
1988-10-01	82
1989-01-01	83.6
1989-04-01	83.5
1989-07-01	84
1989-10-01	84.1
1990-01-01	82.4
1990-04-01	81.7
1990-07-01	81.9
1990-10-01	80.6
1991-01-01	82.8
1991-04-01	80
1991-07-01	78.9
1991-10-01	80.3
1992-01-01	78.7
1992-04-01	79
1992-07-01	78.2
1992-10-01	76.6
1993-01-01	78.3
1993-04-01	78.8
1993-07-01	79.4
1993-10-01	77.1
1994-01-01	79.1
1994-04-01	78.7
1994-07-01	80.7
1994-10-01	80.3
1995-01-01	81.7
1995-04-01	81.2
1995-07-01	81.3
1995-10-01	80.8
1996-01-01	78.1
1996-04-01	78.5
1996-07-01	76.5
1996-10-01	76.2
1997-01-01	77.8
1997-04-01	80
1997-07-01	81.7
1997-10-01	83.7
1998-01-01	87.2
1998-04-01	87
1998-07-01	84.7
1998-10-01	86
1999-01-01	84.3
1999-04-01	82.6
1999-07-01	84.7
1999-10-01	86.2
2000-01-01	85.7
2000-04-01	86.2
2000-07-01	87.4
2000-10-01	87.8
2001-01-01	87.2
2001-04-01	86.8
2001-07-01	86.4
2001-10-01	84.9
2002-01-01	84.4
2002-04-01	83.1
2002-07-01	83.1
2002-10-01	83.6
2003-01-01	82.9
2003-04-01	84.3
2003-07-01	83.6
2003-10-01	83
2004-01-01	82.2
2004-04-01	84.1
2004-07-01	86.2
2004-10-01	84.4
2005-01-01	82.9
2005-04-01	79.8
2005-07-01	74.5
2005-10-01	79.1
2006-01-01	79.6
2006-04-01	81
2006-07-01	85.5
2006-10-01	86.4
2007-01-01	88.2
2007-04-01	87.3
2007-07-01	86.8
2007-10-01	86
2008-01-01	85.4
2008-04-01	84.7
2008-07-01	85
2008-10-01	83.5
2009-01-01	66.9
2009-04-01	62.2
2009-07-01	63.3
2009-10-01	69.1
2010-01-01	76.4
2010-04-01	79.3
2010-07-01	80.3
2010-10-01	78.1
2011-01-01	82.9
2011-04-01	87.3
2011-07-01	82.7
2011-10-01	79.8
2012-01-01	79.2
2012-04-01	82.7
2012-07-01	78.1
2012-10-01	65.7
2013-01-01	66.9
2013-04-01	62.3
2013-07-01	63.1
2013-10-01	65.8
2014-01-01	67.7
2014-04-01	64.8
2014-07-01	65.4
2014-10-01	66.9
2015-01-01	66.4
2015-04-01	65.6
2015-07-01	69.0
2015-10-01	72.2
2016-01-01	72.4
2016-04-01	76.1
2016-07-01	77.6
2016-10-01	81.3
2017-01-01	82.6
2017-04-01	82.1
2017-07-01	80.1
2017-10-01	81.1
2018-01-01	83.1
2018-04-01	82.0
2018-07-01	80.8