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Percent of Commercial Natural Gas Deliveries in Illinois Represented by the Price (Percent)
Percent of Commercial Natural Gas Deliveries in Illinois Represented by the Price (Percent)
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
  1989 71.8 73.5 69.8 69.6 67.5 59.7 50.2 47.4 62.4 64.5 68.9 74.5
  1990 65.6 65.7 60.2 55.3 52.9 40.6 40.7 41.8 44.5 54.6 52.2 63.6
  1991 66.1 62.7 61.0 56.7 49.1 45.4 39.4 43.5 55.0 54.8 60.4 60.3
  1992 63.0 58.2 59.5 57.5 53.0 43.4 44.4 49.2 47.0 55.5 60.5 59.9
  1993 61.0 58.4 58.3 56.3 51.5 43.4 42.9 38.3 50.0 50.2 53.7 56.0
  1994 59.1 59.9 58.0 49.9 46.5 37.8 36.1 36.3 39.7 47.5 49.9 52.0
  1995 54.8 53.2 52.9 49.3 40.2 42.9 38.6 38.2 39.6 46.6 51.8 53.3
  1996 56.9 58.3 57.8 51.7 49.7 44.1 39.6 43.0 43.2 48.8 53.0 56.1
  1997 62.9 55.3 55.4 54.1 48.4 55.8 46.7 40.3 47.7 50.4 52.5 52.1
  1998 54.5 51.3 57.8 45.0 35.7 43.2 27.8 36.5 37.3 40.7 44.8 45.2
  1999 47.6 47.3 49.0 42.2 36.0 34.8 27.2 25.4 35.6 39.8 39.4 43.2
  2000 46.1 46.8 45.4 41.7 33.6 26.9 27.3 30.0 34.1 34.1 45.2 43.5
  2001 47.6 44.7 43.6 41.4 34.5 29.8 30.9 28.3 32.7 37.0 36.8 42.5
  2002 43.6 44.1 45.7 38.8 35.4 28.1 29.5 28.8 30.0 39.1 41.6 46.3
  2003 46.2 47.2 48.2 41.9 32.6 35.1 33.8 34.4 37.4 38.4 39.9 45.2
  2004 45.4 47.4 42.5 39.9 30.3 33.9 28.3 30.2 30.6 37.7 40.1 44.6
  2005 46.9 44.2 44.5 39.8 33.0 28.9 32.9 30.4 31.3 39.5 39.5 44.6
  2006 46.1 45.1 43.9 41.9 36.7 27.7 29.5 27.3 29.1 33.7 38.0 42.3
  2007 44.9 45.6 47.5 44.0 46.8 38.6 31.9 30.2 32.7 33.2 36.6 43.3
  2008 46.5 47.9 48.6 47.7 38.4 39.9

Release Date: 8/29/2008
Next Release Date: 9/30/2008

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