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| year | consumption | change |
| 1986 | 4.50 | NA |
| 1987 | 4.30 | -4.44% |
| 1988 | 5.60 | 30.23% |
| 1989 | 4.90 | -12.50% |
| 1990 | 4.50 | -8.16% |
| 1991 | 5.50 | 22.22% |
| 1992 | 4.80 | -12.73% |
| 1993 | 4.90 | 2.08% |
| 1994 | 5.20 | 6.12% |
| 1995 | 3.40 | -34.62% |
| 1996 | 3.10 | -8.82% |
| 1997 | 5.20 | 67.74% |
| 1998 | 5.70 | 9.62% |
| 1999 | 6.30 | 10.53% |
| 2000 | 7.60 | 20.63% |
| 2001 | 4.10 | -46.05% |
| 2002 | 4.10 | 0.00% |
| 2003 | 3.40 | -17.07% |
| 2004 | 3.40 | 0.00% |
| 2005 | 3.70 | 8.82% |
| 2006 | 3.70 | 0.00% |
| 2007 | .40 | -89.19% |
| 2008 | .40 | 0.00% |
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