NICOR
| Yearly Averages | ||||
| Year | Cents/Therm | |||
| 2009 | 45.73 |  | ||
| 2008 | 97.25 | | ||
| 2007 | 75.73 | | ||
| 2006 | 64.34 | | ||
| 2005 | 85.25 | | ||
| 2004 | 64.58 | | ||
| 2003 | 62.17 | | ||
| 2002 | 36.33 | | ||
| 2001 | 46.33 | | ||
| 2000 | 46.85 | | ||
| 1999 | 29.24 | | ||
| 1998 | 27.32 | | ||
| 1997 | 30.19 | | ||
| 1996 | 30.71 | | ||
| 1995 | 23.40 | | ||
| 1994 | 29.88 | | ||
| 1993 | 33.20 | | ||
| 1992 | 28.39 | | ||
| 1991 | 24.91 | | ||
Last updated: November 4, 2009
Monthly Charges in Cents/Therm
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Spt | Oct | Nov | Dec | |
| '09 | 65.00 | 57.00 | 43.00 | 43.00 | 45.00 | 45.00 | 46.00 | 40.00 | 33.00 | 39.00 | 47.00 | |
| '08 | 77.00 | 87.00 | 97.00 | 99.00 | 124.00 | 123.00 | 145.00 | 108.00 | 84.00 | 81.00 | 77.00 | 65.00 |
| '07 | 67.00 | 72.00 | 83.00 | 85.00 | 86.00 | 88.00 | 80.00 | 70.00 | 64.00 | 68.00 | 70.00 | 65.00 |
| '06 | 109.00 | 94.02 | 67.02 | 66.02 | 61.02 | 50.02 | 50.00 | 50.00 | 59.00 | 44.00 | 55.00 | 67.00 |
| '05 | 72.00 | 67.00 | 64.00 | 76.00 | 78.00 | 70.00 | 74.00 | 75.00 | 100.00 | 117.00 | 117.00 | 113.00 |
| '04 | 69.00 | 60.00 | 55.00 | 59.00 | 59.00 | 72.00 | 72.00 | 65.00 | 62.00 | 58.00 | 74.00 | 70.00 |
| '03 | 54.00 | 55.00 | 83.00 | 67.00 | 63.00 | 67.00 | 67.00 | 61.00 | 58.00 | 55.00 | 58.00 | 58.00 |
| '02 | 27.00 | 26.00 | 25.00 | 31.00 | 38.00 | 41.00 | 39.00 | 35.00 | 35.00 | 41.00 | 49.00 | 49.00 |
| '01 | 95.00 | 93.00 | 70.00 | 53.00 | 52.00 | 40.00 | 30.00 | 27.00 | 27.00 | 20.00 | 22.00 | 27.00 |
| '00 | 33.50 | 32.20 | 32.00 | 34.00 | 37.00 | 45.00 | 49.50 | 49.50 | 51.50 | 63.00 | 65.00 | 70.00 |
| '99 | 26.90 | 23.50 | 23.50 | 23.00 | 25.00 | 27.50 | 30.00 | 30.00 | 33.00 | 37.00 | 37.00 | 34.50 |
| '98 | 29.80 | 25.50 | 27.20 | 27.10 | 30.30 | 29.40 | 27.50 | 26.90 | 25.30 | 25.00 | 25.70 | 28.10 |
| '97 | 44.19 | 43.79 | 33.24 | 25.45 | 20.19 | 22.97 | 22.84 | 22.70 | 25.58 | 29.47 | 36.52 | 35.40 |
| '96 | 25.38 | 26.84 | 30.65 | 30.56 | 33.49 | 33.33 | 32.58 | 31.93 | 31.59 | 29.99 | 30.76 | 31.42 |
| '95 | 28.41 | 28.66 | 24.56 | 23.33 | 23.20 | 22.61 | 22.77 | 19.98 | 19.28 | 21.03 | 22.45 | 24.55 |
| '94 | 34.32 | 33.49 | 36.32 | 35.88 | 30.68 | 31.45 | 27.79 | 28.55 | 27.07 | 24.72 | 23.54 | 24.76 |
| '93 | 32.56 | 31.51 | 28.56 | 31.23 | 34.01 | 35.97 | 33.74 | 34.00 | 33.57 | 36.00 | 32.84 | 34.42 |
| '92 | 29.11 | 27.92 | 22.84 | 24.53 | 24.73 | 26.60 | 27.84 | 26.41 | 29.08 | 30.62 | 36.09 | 34.88 |
| '91 | 30.80 | 28.93 | 26.19 | 25.54 | 23.95 | 23.33 | 22.68 | 21.94 | 21.55 | 22.61 | 24.94 | 26.45 |