Quarter	Percent of Capacity, Seasonally Adjusted
1978-04-01	71.89
1978-07-01	71.88
1978-10-01	74.71
1979-01-01	74.52
1979-04-01	75.18
1979-07-01	77.12
1979-10-01	77.96
1980-01-01	78.71
1980-04-01	78.52
1980-07-01	77.25
1980-10-01	74.39
1981-01-01	74.61
1981-04-01	74.76
1981-07-01	74.69
1981-10-01	75.41
1982-01-01	75.49
1982-04-01	75.82
1982-07-01	75.87
1982-10-01	76.41
1983-01-01	76.05
1983-04-01	75.57
1983-07-01	75.96
1983-10-01	75.81
1984-01-01	75.38
1984-04-01	75.77
1984-07-01	77.00
1984-10-01	76.57
1985-01-01	76.80
1985-04-01	77.60
1985-07-01	77.50
1985-10-01	78.70
1986-01-01	77.80
1986-04-01	77.20
1986-07-01	77.20
1986-10-01	77.00
1987-01-01	76.70
1987-04-01	76.50
1987-07-01	76.70
1987-10-01	76.20
1988-01-01	77.80
1988-04-01	78.20
1988-07-01	78.40
1988-10-01	78.60
1989-01-01	79.70
1989-04-01	79.90
1989-07-01	80.80
1989-10-01	81.00
1990-01-01	81.50
1990-04-01	81.40
1990-07-01	80.80
1990-10-01	80.70
1991-01-01	80.60
1991-04-01	79.60
1991-07-01	79.30
1991-10-01	78.20
1992-01-01	77.70
1992-04-01	77.90
1992-07-01	77.60
1992-10-01	76.20
1993-01-01	75.40
1993-04-01	74.40
1993-07-01	74.60
1993-10-01	74.90
1994-01-01	76.40
1994-04-01	77.10
1994-07-01	77.70
1994-10-01	79.00
1995-01-01	80.50
1995-04-01	81.60
1995-07-01	80.90
1995-10-01	80.30
1996-01-01	79.60
1996-04-01	79.20
1996-07-01	79.10
1996-10-01	79.90
1997-01-01	80.60
1997-04-01	80.20
1997-07-01	81.80
1997-10-01	82.90
1998-01-01	82.40
1998-04-01	82.90
1998-07-01	83.00
1998-10-01	82.30
1999-01-01	79.70
1999-04-01	80.80
1999-07-01	81.50
1999-10-01	81.50
2000-01-01	82.90
2000-04-01	84.50
2000-07-01	84.30
2000-10-01	84.50
2001-01-01	84.80
2001-04-01	82.70
2001-07-01	81.40
2001-10-01	80.20
2002-01-01	80.40
2002-04-01	79.80
2002-07-01	80.20
2002-10-01	79.80
2003-01-01	79.80
2003-04-01	78.60
2003-07-01	77.70
2003-10-01	79.30
2004-01-01	79.70
2004-04-01	79.80
2004-07-01	81.30
2004-10-01	81.00
2005-01-01	80.80
2005-04-01	79.60
2005-07-01	78.50
2005-10-01	79.40
2006-01-01	80.70
2006-04-01	83.10
2006-07-01	83.90
2006-10-01	83.80
2007-01-01	83.30
2007-04-01	83.00
2007-07-01	83.50
2007-10-01	83.80
2008-01-01	83.90
2008-04-01	83.80
2008-07-01	83.50
2008-10-01	81.60
2009-01-01	74.80
2009-04-01	70.20
2009-07-01	71.00
2009-10-01	72.10
2010-01-01	75.10
2010-04-01	78.20
2010-07-01	79.00
2010-10-01	79.40
2011-01-01	81.20
2011-04-01	82.60
2011-07-01	80.10
2011-10-01	78.00
2012-01-01	79.00
2012-04-01	78.40
2012-07-01	76.90
2012-10-01	76.60
2013-01-01	75.50
2013-04-01	76.40
2013-07-01	76.40
2013-10-01	78.20
2014-01-01	79.50
2014-04-01	79.00
2014-07-01	79.20
2014-10-01	79.40
2015-01-01	79.70
2015-04-01	79.80
2015-07-01	80.00
2015-10-01	79.20
2016-01-01	80.00
2016-04-01	79.30
2016-07-01	79.70
2016-10-01	80.90
2017-01-01	80.70
2017-04-01	81.40
2017-07-01	82.00
2017-10-01	82.90
2018-01-01	82.10
2018-04-01	81.20
2018-07-01	79.90
2018-10-01	80.80