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| year | consumption | change |
| 1980 | 8.64 | NA |
| 1981 | 8.87 | 2.66% |
| 1982 | 8.79 | -0.90% |
| 1983 | 8.86 | 0.80% |
| 1984 | 9.56 | 7.91% |
| 1985 | 10.00 | 4.56% |
| 1986 | 11.28 | 12.85% |
| 1987 | 13.76 | 22.00% |
| 1988 | 13.62 | -1.03% |
| 1989 | 14.15 | 3.89% |
| 1990 | 14.94 | 5.59% |
| 1991 | 21.22 | 42.01% |
| 1992 | 30.01 | 41.39% |
| 1993 | 32.95 | 9.82% |
| 1994 | 36.55 | 10.93% |
| 1995 | 40.46 | 10.71% |
| 1996 | 42.74 | 5.63% |
| 1997 | 50.57 | 18.32% |
| 1998 | 59.84 | 18.33% |
| 1999 | 64.73 | 8.16% |
| 2000 | 77.93 | 20.39% |
| 2001 | 86.99 | 11.64% |
| 2002 | 102.65 | 17.99% |
| 2003 | 118.23 | 15.18% |
| 2004 | 142.58 | 20.59% |
| 2005 | 163.57 | 14.73% |
| 2006 | 186.86 | 14.24% |
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