Quarter	Percent of Capacity, Seasonally Adjusted
1971-10-01	80.5500000000000
1972-01-01	82.9300000000000
1972-04-01	84.3100000000000
1972-10-01	83.5200000000000
1973-01-01	84.9400000000000
1973-04-01	84.3500000000000
1973-10-01	85.4400000000000
1974-01-01	84.0500000000000
1974-04-01	85.3400000000000
1974-10-01	83.4400000000000
1975-01-01	80.2200000000000
1975-04-01	76.1700000000000
1975-10-01	75.5100000000000
1976-01-01	79.3700000000000
1976-04-01	77.0500000000000
1976-10-01	79.6300000000000
1977-01-01	79.4600000000000
1977-04-01	79.8600000000000
1977-10-01	77.8100000000000
1978-01-01	77.9995225098262
1978-04-01	78.4062764822800
1978-07-01	79.5954655316853
1978-10-01	79.9859668682123
1979-01-01	81.0291376092136
1979-04-01	80.3648371172645
1979-07-01	81.6403373308073
1979-10-01	82.9385701573263
1980-01-01	83.0944084438550
1980-04-01	82.2905117376529
1980-07-01	80.7168245947872
1980-10-01	78.8436282890831
1981-01-01	78.2022816036642
1981-04-01	79.2009787417827
1981-07-01	78.7983719915512
1981-10-01	77.7168713092445
1982-01-01	77.3570543385173
1982-04-01	76.1142809282946
1982-07-01	75.8202759954345
1982-10-01	77.6542173216144
1983-01-01	78.4543107960982
1983-04-01	79.0883265401663
1983-07-01	79.7790508818865
1983-10-01	80.6591719457384
1984-01-01	80.4936672146308
1984-04-01	82.0987139878528
1984-07-01	82.6951280304206
1984-10-01	83.7378628311430
1985-01-01	83.6000000000000
1985-04-01	84.0000000000000
1985-07-01	83.1000000000000
1985-10-01	83.5000000000000
1986-01-01	84.4000000000000
1986-04-01	83.9000000000000
1986-07-01	85.0000000000000
1986-10-01	83.6000000000000
1987-01-01	84.4000000000000
1987-04-01	84.0000000000000
1987-07-01	84.0000000000000
1987-10-01	83.8000000000000
1988-01-01	84.2000000000000
1988-04-01	84.0000000000000
1988-07-01	85.0000000000000
1988-10-01	85.0000000000000
1989-01-01	85.3000000000000
1989-04-01	86.2000000000000
1989-07-01	85.7000000000000
1989-10-01	86.5000000000000
1990-01-01	86.0000000000000
1990-04-01	86.2000000000000
1990-07-01	86.0000000000000
1990-10-01	85.4000000000000
1991-01-01	84.8000000000000
1991-04-01	85.1000000000000
1991-07-01	84.7000000000000
1991-10-01	83.7000000000000
1992-01-01	83.8000000000000
1992-04-01	83.5000000000000
1992-07-01	84.1000000000000
1992-10-01	83.1000000000000
1993-01-01	82.1000000000000
1993-04-01	81.1000000000000
1993-07-01	80.3000000000000
1993-10-01	80.5000000000000
1994-01-01	81.1000000000000
1994-04-01	82.1000000000000
1994-07-01	82.9000000000000
1994-10-01	84.7000000000000
1995-01-01	84.6000000000000
1995-04-01	84.6000000000000
1995-07-01	85.0000000000000
1995-10-01	84.5000000000000
1996-01-01	84.4000000000000
1996-04-01	83.5000000000000
1996-07-01	83.8000000000000
1996-10-01	84.2000000000000
1997-01-01	84.3000000000000
1997-04-01	83.9000000000000
1997-07-01	84.5000000000000
1997-10-01	84.9000000000000
1998-01-01	85.1000000000000
1998-04-01	85.9000000000000
1998-07-01	85.3000000000000
1998-10-01	84.8000000000000
1999-01-01	84.3000000000000
1999-04-01	84.3000000000000
1999-07-01	83.8000000000000
1999-10-01	84.0000000000000
2000-01-01	84.7000000000000
2000-04-01	84.7000000000000
2000-07-01	84.1000000000000
2000-10-01	84.6000000000000
2001-01-01	85.1000000000000
2001-04-01	84.7000000000000
2001-07-01	84.8000000000000
2001-10-01	83.7000000000000
2002-01-01	83.5000000000000
2002-04-01	82.9000000000000
2002-07-01	82.8000000000000
2002-10-01	82.8000000000000
2003-01-01	82.4000000000000
2003-04-01	81.9000000000000
2003-07-01	81.2000000000000
2003-10-01	81.3000000000000
2004-01-01	82.1000000000000
2004-04-01	82.8000000000000
2004-07-01	83.2000000000000
2004-10-01	82.6000000000000
2005-01-01	82.3000000000000
2005-04-01	81.9000000000000
2005-07-01	81.7000000000000
2005-10-01	82.1000000000000
2006-01-01	81.4000000000000
2006-04-01	81.9000000000000
2006-07-01	82.8000000000000
2006-10-01	83.2000000000000
2007-01-01	83.5000000000000
2007-04-01	83.4000000000000
2007-07-01	83.5000000000000
2007-10-01	83.9000000000000
2008-01-01	83.5000000000000
2008-04-01	83.4000000000000
2008-07-01	83.3000000000000
2008-10-01	82.9000000000000
2009-01-01	77.6000000000000
2009-04-01	74.8000000000000
2009-07-01	75.3000000000000
2009-10-01	76.1000000000000
2010-01-01	77.4000000000000
2010-04-01	78.8000000000000
2010-07-01	79.6000000000000
2010-10-01	79.7000000000000
2011-01-01	80.7000000000000
2011-04-01	81.1000000000000
2011-07-01	80.6000000000000
2011-10-01	78.9000000000000
2012-01-01	79.8000000000000
2012-04-01	78.6000000000000
2012-07-01	78.3000000000000
2012-10-01	77.0000000000000
2013-01-01	77.0000000000000
2013-04-01	75.9000000000000
2013-07-01	76.6000000000000
2013-10-01	77.4000000000000
2014-01-01	79.7000000000000
2014-04-01	81.0000000000000
2014-07-01	79.6000000000000
2014-10-01	80.3000000000000
2015-01-01	80.6000000000000
2015-04-01	82.3000000000000
2015-07-01	82.2000000000000
2015-10-01	82.2000000000000
2016-01-01	81.4000000000000
2016-04-01	81.7000000000000
2016-07-01	81.5000000000000
2016-10-01	82.1000000000000
2017-01-01	81.4000000000000
2017-04-01	82.5000000000000
2017-07-01	83.1000000000000
2017-10-01	83.1000000000000
2018-01-01	83.9000000000000
2018-04-01	83.6000000000000
2018-07-01	84.4000000000000
2018-10-01	84.0000000000000