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| year | consumption | change |
| 1992 | 14.00 | NA |
| 1993 | 11.00 | -21.43% |
| 1994 | 9.30 | -15.45% |
| 1995 | 8.60 | -7.53% |
| 1996 | 13.00 | 51.16% |
| 1997 | 17.00 | 30.77% |
| 1998 | 13.00 | -23.53% |
| 1999 | 13.00 | 0.00% |
| 2000 | 10.00 | -23.08% |
| 2001 | 14.00 | 40.00% |
| 2002 | 15.00 | 7.14% |
| 2003 | 18.00 | 20.00% |
| 2004 | 14.00 | -22.22% |
| 2005 | 15.00 | 7.14% |
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