Quarter	Percent of Capacity, Seasonally Adjusted
1991-01-01	88.8
1991-04-01	87.9
1991-07-01	86.9
1991-10-01	70.9
1992-01-01	72.9
1992-04-01	75.5
1992-07-01	73.7
1992-10-01	71.9
1993-01-01	71.8
1993-04-01	71.6
1993-07-01	76.4
1993-10-01	76.4
1994-01-01	75.6
1994-04-01	73.2
1994-07-01	72.1
1994-10-01	73.7
1995-01-01	75.9
1995-04-01	77.9
1995-07-01	76.8
1995-10-01	79.5
1996-01-01	78.5
1996-04-01	80
1996-07-01	79.8
1996-10-01	83.9
1997-01-01	82.2
1997-04-01	80.3
1997-07-01	83.2
1997-10-01	82.7
1998-01-01	80.3
1998-04-01	81.6
1998-07-01	84.5
1998-10-01	81.9
1999-01-01	82.2
1999-04-01	83.1
1999-07-01	83.4
1999-10-01	81.4
2000-01-01	81
2000-04-01	79.9
2000-07-01	81.3
2000-10-01	84.1
2001-01-01	84.7
2001-04-01	84
2001-07-01	84.8
2001-10-01	86.1
2002-01-01	87.5
2002-04-01	86.2
2002-07-01	84.8
2002-10-01	83.8
2003-01-01	85
2003-04-01	84
2003-07-01	82.5
2003-10-01	83.7
2004-01-01	84.3
2004-04-01	85.2
2004-07-01	85.5
2004-10-01	86.5
2005-01-01	86.8
2005-04-01	87.1
2005-07-01	86.5
2005-10-01	86.7
2006-01-01	86.5
2006-04-01	87.1
2006-07-01	88
2006-10-01	87.2
2007-01-01	89.2
2007-04-01	88.4
2007-07-01	88.9
2007-10-01	90
2008-01-01	89.7
2008-04-01	91.2
2008-07-01	89.4
2008-10-01	85.8
2009-01-01	77.6
2009-04-01	75.2
2009-07-01	75.3
2009-10-01	77.2
2010-01-01	77.2
2010-04-01	78.1
2010-07-01	81.5
2010-10-01	81.3
2011-01-01	83.7
2011-04-01	85.5
2011-07-01	84.7
2011-10-01	82.8
2012-01-01	84.6
2012-04-01	83.6
2012-07-01	81.2
2012-10-01	81.2
2013-01-01	80.9
2013-04-01	82.2
2013-07-01	80.7
2013-10-01	82.2
2014-01-01	81.2
2014-04-01	83.5
2014-07-01	82.8
2014-10-01	84.4
2015-01-01	86.2
2015-04-01	85
2015-07-01	85.6
2015-10-01	83.9
2016-01-01	84.5
2016-04-01	84.7
2016-07-01	84.7
2016-10-01	84.1
2017-01-01	84.9
2017-04-01	83.1
2017-07-01	84.4
2017-10-01	84.3
2018-01-01	85.8
2018-04-01	85.4
2018-07-01	86.2
2018-10-01	85.8