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| year | consumption | change |
| 1980 | 1.97 | NA |
| 1981 | 2.62 | 32.99% |
| 1982 | 3.41 | 30.15% |
| 1983 | 3.89 | 14.08% |
| 1984 | 4.31 | 10.80% |
| 1985 | 4.70 | 9.05% |
| 1986 | 4.35 | -7.45% |
| 1987 | 4.31 | -0.92% |
| 1988 | 4.60 | 6.73% |
| 1989 | 5.05 | 9.78% |
| 1990 | 5.19 | 2.77% |
| 1991 | 5.47 | 5.39% |
| 1992 | 5.42 | -0.91% |
| 1993 | 5.38 | -0.74% |
| 1994 | 6.00 | 11.52% |
| 1995 | 5.83 | -2.83% |
| 1996 | 6.21 | 6.52% |
| 1997 | 6.88 | 10.79% |
| 1998 | 8.47 | 23.11% |
| 1999 | 10.06 | 18.77% |
| 2000 | 11.05 | 9.84% |
| 2001 | 9.92 | -10.23% |
| 2002 | 9.73 | -1.92% |
| 2003 | 9.33 | -4.11% |
| 2004 | 9.77 | 4.72% |
| 2005 | 9.41 | -3.68% |
| 2006 | 9.94 | 5.63% |
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