Quarter	Percent of Capacity, Seasonally Adjusted
1960-01-01	88.2
1960-04-01	88.6
1960-07-01	88.8
1960-10-01	88.4
1961-01-01	88.2
1961-04-01	87.6
1961-07-01	87.8
1961-10-01	86.3
1962-01-01	87.2
1962-04-01	87.6
1962-07-01	86.9
1962-10-01	87.2
1963-01-01	86.2
1963-04-01	85.7
1963-07-01	85.9
1963-10-01	86.1
1964-01-01	87.3
1964-04-01	87.8
1964-07-01	87.8
1964-10-01	87.9
1965-01-01	88.4
1965-04-01	88
1965-07-01	87.7
1965-10-01	87.7
1966-01-01	86.6
1966-04-01	87.1
1966-07-01	85.6
1966-10-01	82.7
1967-01-01	78.6
1967-04-01	77.1
1967-07-01	78.6
1967-10-01	80.8
1968-01-01	82.6
1968-04-01	83.9
1968-07-01	85.6
1968-10-01	86.9
1969-01-01	88.6
1969-04-01	89.6
1969-07-01	89.9
1969-10-01	90.2
1970-01-01	92.4
1970-04-01	91.6
1970-07-01	90.7
1970-10-01	89.4
1971-01-01	88.3
1971-04-01	87.4
1971-07-01	86.2
1971-10-01	85.1
1972-01-01	84.6
1972-04-01	84.7
1972-07-01	85.1
1972-10-01	85.9
1973-01-01	87.4
1973-04-01	87.4
1973-07-01	87.1
1973-10-01	86.6
1974-01-01	84.9
1974-04-01	83.3
1974-07-01	82.1
1974-10-01	79.7
1975-01-01	76.6
1975-04-01	75.2
1975-07-01	75.3
1975-10-01	77
1976-01-01	78.4
1976-04-01	80.2
1976-07-01	80.9
1976-10-01	81.5
1977-01-01	81.3
1977-04-01	80.4
1977-07-01	79.6
1977-10-01	79.9
1978-01-01	80.4
1978-04-01	80.7
1978-07-01	82.6
1978-10-01	81.4
1979-01-01	83.2
1979-04-01	84.9
1979-07-01	85.6
1979-10-01	85.4
1980-01-01	85.3
1980-04-01	83.2
1980-07-01	81.5
1980-10-01	79.6
1981-01-01	79.6
1981-04-01	79.1
1981-07-01	78.8
1981-10-01	78.6
1982-01-01	78.3
1982-04-01	77.2
1982-07-01	74.8
1982-10-01	74.7
1983-01-01	76.5
1983-04-01	78
1983-07-01	79
1983-10-01	80.1
1984-01-01	81.6
1984-04-01	77.1
1984-07-01	80.8
1984-10-01	82.1
1985-01-01	82.4
1985-04-01	82.7
1985-07-01	84.7
1985-10-01	84.5
1986-01-01	85.1
1986-04-01	84.1
1986-07-01	85.3
1986-10-01	84.9
1987-01-01	84.3
1987-04-01	83.3
1987-07-01	84.4
1987-10-01	84.1
1988-01-01	84.6
1988-04-01	84.7
1988-07-01	85.8
1988-10-01	87
1989-01-01	88.2
1989-04-01	88.2
1989-07-01	88.9
1989-10-01	89.1
1990-01-01	89.3
1990-04-01	89.9
1990-07-01	89.5
1990-10-01	90
1991-01-01	88.9
1991-04-01	88.6
1991-07-01	86.8
1991-10-01	85.2
1992-01-01	85.6
1992-04-01	81.4
1992-07-01	79.9
1992-10-01	76.7
1993-01-01	75.6
1993-04-01	76.1
1993-07-01	76.0
1993-10-01	76.4
1994-01-01	78.1
1994-04-01	80.6
1994-07-01	82.4
1994-10-01	83.7
1995-01-01	84.4
1995-04-01	85.4
1995-07-01	84.4
1995-10-01	83.9
1996-01-01	82.0
1996-04-01	81.6
1996-07-01	81.6
1996-10-01	81.6
1997-01-01	83.0
1997-04-01	83.6
1997-07-01	84.4
1997-10-01	85.0
1998-01-01	85.6
1998-04-01	86.2
1998-07-01	85.9
1998-10-01	84.7
1999-01-01	84.1
1999-04-01	83.6
1999-07-01	84.0
1999-10-01	84.6
2000-01-01	85.7
2000-04-01	86.2
2000-07-01	86.9
2000-10-01	87.8
2001-01-01	88.0
2001-04-01	85.3
2001-07-01	84.3
2001-10-01	82.4
2002-01-01	81.5
2002-04-01	81.9
2002-07-01	82.4
2002-10-01	83.3
2003-01-01	82.1
2003-04-01	82.9
2003-07-01	82.1
2003-10-01	83.7
2004-01-01	83.2
2004-04-01	83.9
2004-07-01	84.4
2004-10-01	84.3
2005-01-01	84.0
2005-04-01	83.6
2005-07-01	83.9
2005-10-01	84.4
2006-01-01	84.7
2006-04-01	86.3
2006-07-01	87.3
2006-10-01	87.9
2007-01-01	88.1
2007-04-01	88.8
2007-07-01	88.4
2007-10-01	88.4
2008-01-01	88.6
2008-04-01	87.9
2008-07-01	86.4
2008-10-01	84.8
2009-01-01	76.5
2009-04-01	70.7
2009-07-01	69.7
2009-10-01	70.8
2010-01-01	73.9
2010-04-01	79.0
2010-07-01	81.9
2010-10-01	82.9
2011-01-01	85.7
2011-04-01	86.9
2011-07-01	86.9
2011-10-01	85.3
2012-01-01	85.6
2012-04-01	85.5
2012-07-01	83.0
2012-10-01	82.1
2013-01-01	82.7
2013-04-01	82.2
2013-07-01	82.5
2013-10-01	82.3
2014-01-01	84.4
2014-04-01	84.0
2014-07-01	84.3
2014-10-01	84.5
2015-01-01	84.6
2015-04-01	84.1
2015-07-01	84.2
2015-10-01	84.2
2016-01-01	84.6
2016-04-01	84.1
2016-07-01	84.5
2016-10-01	85.3
2017-01-01	85.5
2017-04-01	86.1
2017-07-01	86.9
2017-10-01	87.7
2018-01-01	88.2
2018-04-01	87.8
2018-07-01	87.8
2018-10-01	87.1