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| year | consumption | change |
| 1980 | 1.14 | NA |
| 1981 | 1.25 | 9.65% |
| 1982 | 1.67 | 33.60% |
| 1983 | 1.28 | -23.35% |
| 1984 | 1.48 | 15.63% |
| 1985 | 1.35 | -8.78% |
| 1986 | 1.42 | 5.19% |
| 1987 | 1.44 | 1.41% |
| 1988 | 1.41 | -2.08% |
| 1989 | 2.06 | 46.10% |
| 1990 | 2.12 | 2.91% |
| 1991 | 2.30 | 8.49% |
| 1992 | 2.34 | 1.74% |
| 1993 | 2.21 | -5.56% |
| 1994 | 2.40 | 8.60% |
| 1995 | 2.66 | 10.83% |
| 1996 | 2.83 | 6.39% |
| 1997 | 3.16 | 11.66% |
| 1998 | 3.18 | 0.63% |
| 1999 | 3.62 | 13.84% |
| 2000 | 4.20 | 16.02% |
| 2001 | 4.50 | 7.14% |
| 2002 | 5.16 | 14.67% |
| 2003 | 5.53 | 7.17% |
| 2004 | 5.84 | 5.61% |
| 2005 | 6.38 | 9.25% |
| 2006 | 7.30 | 14.42% |
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