Data
| Year | Gas Price | Natural Gas | Electricity | S Prices | Index |
| 1993 | 1.07 | 6.16 | 8.32 | 15.55 | 100.00% |
| 1994 | 1.08 | 6.41 | 8.38 | 15.87 | 102.06% |
| 1995 | 1.16 | 6.06 | 8.4 | 15.62 | 100.45% |
| 1996 | 1.27 | 6.34 | 8.36 | 15.97 | 102.70% |
| 1997 | 1.24 | 6.94 | 8.43 | 16.61 | 106.82% |
| 1998 | 1.07 | 6.82 | 8.26 | 16.15 | 103.86% |
| 1999 | 1.18 | 6.69 | 8.16 | 16.03 | 103.09% |
| 2000 | 1.52 | 7.76 | 8.24 | 17.52 | 112.67% |
| 2001 | 1.46 | 9.63 | 8.63 | 19.72 | 126.82% |
| 2002 | 1.39 | 7.89 | 8.43 | 17.71 | 113.89% |
| 2003 | 1.60 | 9.63 | 8.72 | 19.95 | 128.30% |
| 2004 | 1.90 | 10.75 | 8.94 | 21.59 | 138.84% |
| 2005 | 2.31 | 12.70 | 9.43 | 24.44 | 157.17% |
| 2006 | 2.62 | 13.73 | 10.37 | 26.72 | 171.83% |
| 2007 | 2.84 | 13.08 | 10.64 | 26.56 | 170.80% |
| 2008 | 3.30 | 13.89 | 11.25 | 28.44 | 182.89% |
| b. | 82.89% |
| c. | 76.10% |
b. ((28.44 - 15.55)/15.55)*100 = 82.89%
c. ((28.44-16.15)/16.15)*100 = 76.10%