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| year | consumption | change |
| 1980 | 1.48 | NA |
| 1981 | 1.46 | -1.35% |
| 1982 | 1.50 | 2.74% |
| 1983 | 1.53 | 2.00% |
| 1984 | 1.69 | 10.46% |
| 1985 | 1.64 | -2.96% |
| 1986 | 1.68 | 2.44% |
| 1987 | 1.71 | 1.79% |
| 1988 | 1.82 | 6.43% |
| 1989 | 2.40 | 31.87% |
| 1990 | 2.49 | 3.75% |
| 1991 | 2.67 | 7.23% |
| 1992 | 2.67 | 0.00% |
| 1993 | 2.78 | 4.12% |
| 1994 | 2.64 | -5.04% |
| 1995 | 2.58 | -2.27% |
| 1996 | 2.57 | -0.39% |
| 1997 | 2.57 | 0.00% |
| 1998 | 2.82 | 9.73% |
| 1999 | 3.13 | 10.99% |
| 2000 | 3.45 | 10.22% |
| 2001 | 3.20 | -7.25% |
| 2002 | 3.41 | 6.56% |
| 2003 | 3.27 | -4.11% |
| 2004 | 3.48 | 6.42% |
| 2005 | 4.27 | 22.70% |
| 2006 | 4.48 | 4.92% |
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