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| year | consumption | change |
| 1980 | 3.10 | NA |
| 1981 | 3.51 | 13.23% |
| 1982 | 13.16 | 274.93% |
| 1983 | 14.79 | 12.39% |
| 1984 | 16.32 | 10.34% |
| 1985 | 17.32 | 6.13% |
| 1986 | 18.12 | 4.63% |
| 1987 | 19.04 | 5.08% |
| 1988 | 20.58 | 8.07% |
| 1989 | 22.08 | 7.29% |
| 1990 | 17.96 | -18.68% |
| 1991 | 18.70 | 4.17% |
| 1992 | 18.90 | 1.07% |
| 1993 | 18.68 | -1.16% |
| 1994 | 20.69 | 10.75% |
| 1995 | 25.86 | 24.99% |
| 1996 | 26.39 | 2.05% |
| 1997 | 30.30 | 14.82% |
| 1998 | 31.49 | 3.93% |
| 1999 | 34.83 | 10.58% |
| 2000 | 37.25 | 6.95% |
| 2001 | 37.42 | 0.46% |
| 2002 | 40.49 | 8.20% |
| 2003 | 41.95 | 3.60% |
| 2004 | 44.41 | 5.86% |
| 2005 | 49.14 | 10.65% |
| 2006 | 55.44 | 12.83% |
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