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| year | consumption | change |
| 1980 | 5.51 | NA |
| 1981 | 6.05 | 9.80% |
| 1982 | 5.16 | -14.71% |
| 1983 | 6.46 | 25.19% |
| 1984 | 8.64 | 33.75% |
| 1985 | 10.72 | 24.07% |
| 1986 | 11.50 | 7.28% |
| 1987 | 12.27 | 6.70% |
| 1988 | 11.98 | -2.36% |
| 1989 | 57.19 | 377.38% |
| 1990 | 67.99 | 18.88% |
| 1991 | 73.52 | 8.13% |
| 1992 | 77.49 | 5.40% |
| 1993 | 79.70 | 2.85% |
| 1994 | 80.20 | 0.63% |
| 1995 | 78.07 | -2.66% |
| 1996 | 79.37 | 1.67% |
| 1997 | 80.79 | 1.79% |
| 1998 | 80.66 | -0.16% |
| 1999 | 83.45 | 3.46% |
| 2000 | 85.70 | 2.70% |
| 2001 | 82.67 | -3.54% |
| 2002 | 92.64 | 12.06% |
| 2003 | 93.53 | 0.96% |
| 2004 | 97.09 | 3.81% |
| 2005 | 99.68 | 2.67% |
| 2006 | 110.40 | 10.75% |
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