Quarter	Percent of Capacity, Seasonally Adjusted
1985-01-01	62
1985-04-01	60.6
1985-07-01	70.1
1985-10-01	67.5
1986-01-01	70.5
1986-04-01	72.7
1986-07-01	74.6
1986-10-01	66.8
1987-01-01	67.7
1987-04-01	74.8
1987-07-01	69.6
1987-10-01	73.9
1988-01-01	75
1988-04-01	73.3
1988-07-01	71.3
1988-10-01	76.5
1989-01-01	74
1989-04-01	73.4
1989-07-01	73.3
1989-10-01	76.4
1990-01-01	78.7
1990-04-01	75.5
1990-07-01	75.2
1990-10-01	77.4
1991-01-01	76.2
1991-04-01	74.2
1991-07-01	74.3
1991-10-01	77.2
1992-01-01	77.4
1992-04-01	78.5
1992-07-01	75.8
1992-10-01	76.7
1993-01-01	71.6
1993-04-01	74.9
1993-07-01	73.5
1993-10-01	74.4
1994-01-01	76.6
1994-04-01	74.7
1994-07-01	74.7
1994-10-01	73.5
1995-01-01	78.3
1995-04-01	80.1
1995-07-01	79.8
1995-10-01	81.5
1996-01-01	83.3
1996-04-01	74.8
1996-07-01	77.1
1996-10-01	75
1997-01-01	75.9
1997-04-01	79.9
1997-07-01	74
1997-10-01	73.9
1998-01-01	75.7
1998-04-01	76.8
1998-07-01	76.4
1998-10-01	77.6
1999-01-01	73.1
1999-04-01	73.2
1999-07-01	78.4
1999-10-01	78.8
2000-01-01	76.5
2000-04-01	77.7
2000-07-01	78.5
2000-10-01	81.5
2001-01-01	79.8
2001-04-01	80.4
2001-07-01	78
2001-10-01	75.2
2002-01-01	77.5
2002-04-01	76.3
2002-07-01	72.8
2002-10-01	76.9
2003-01-01	74.5
2003-04-01	75.1
2003-07-01	77.1
2003-10-01	73.6
2004-01-01	74.4
2004-04-01	77.7
2004-07-01	75.3
2004-10-01	75
2005-01-01	72.2
2005-04-01	69.7
2005-07-01	78.2
2005-10-01	76.8
2006-01-01	74
2006-04-01	76.1
2006-07-01	76.3
2006-10-01	76.5
2007-01-01	76.8
2007-04-01	77.1
2007-07-01	75.9
2007-10-01	76.4
2008-01-01	79.4
2008-04-01	75.3