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| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | 5.65 | NA |
| 1992 | 6.18 | 9.38% |
| 1993 | 6.53 | 5.66% |
| 1994 | 8.23 | 26.03% |
| 1995 | 8.94 | 8.63% |
| 1996 | 9.57 | 7.05% |
| 1997 | 10.76 | 12.43% |
| 1998 | 13.65 | 26.86% |
| 1999 | 13.12 | -3.88% |
| 2000 | 18.56 | 41.46% |
| 2001 | 21.85 | 17.73% |
| 2002 | 27.54 | 26.04% |
| 2003 | 32.20 | 16.92% |
| 2004 | 39.99 | 24.19% |
| 2005 | 42.85 | 7.15% |
| 2006 | 51.55 | 20.30% |
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