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| year | consumption | change |
| 1980 | 3.79 | NA |
| 1981 | 3.33 | -12.14% |
| 1982 | 3.37 | 1.20% |
| 1983 | 3.23 | -4.15% |
| 1984 | 3.30 | 2.17% |
| 1985 | 3.05 | -7.58% |
| 1986 | 3.52 | 15.41% |
| 1987 | 3.72 | 5.68% |
| 1988 | 3.79 | 1.88% |
| 1989 | 3.16 | -16.62% |
| 1990 | 3.25 | 2.85% |
| 1991 | 3.21 | -1.23% |
| 1992 | 3.77 | 17.45% |
| 1993 | 4.03 | 6.90% |
| 1994 | 3.82 | -5.21% |
| 1995 | 4.01 | 4.97% |
| 1996 | 4.52 | 12.72% |
| 1997 | 5.27 | 16.59% |
| 1998 | 6.10 | 15.75% |
| 1999 | 6.94 | 13.77% |
| 2000 | 7.58 | 9.22% |
| 2001 | 8.66 | 14.25% |
| 2002 | 9.85 | 13.74% |
| 2003 | 11.59 | 17.66% |
| 2004 | 13.20 | 13.89% |
| 2005 | 14.22 | 7.73% |
| 2006 | 15.49 | 8.93% |
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