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| year | consumption | change |
| 1992 | 16.00 | NA |
| 1993 | 6.80 | -57.50% |
| 1994 | 8.10 | 19.12% |
| 1995 | 6.50 | -19.75% |
| 1996 | 9.00 | 38.46% |
| 1997 | 14.00 | 55.56% |
| 1998 | 12.00 | -14.29% |
| 1999 | 14.00 | 16.67% |
| 2000 | 23.00 | 64.29% |
| 2001 | 22.00 | -4.35% |
| 2002 | 23.00 | 4.55% |
| 2003 | 27.00 | 17.39% |
| 2004 | 26.00 | -3.70% |
| 2005 | 25.00 | -3.85% |
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