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| year | consumption | change |
| 1980 | 2.86 | NA |
| 1981 | 3.21 | 12.24% |
| 1982 | 3.80 | 18.38% |
| 1983 | 4.54 | 19.47% |
| 1984 | 4.96 | 9.25% |
| 1985 | 4.53 | -8.67% |
| 1986 | 4.99 | 10.15% |
| 1987 | 5.44 | 9.02% |
| 1988 | 5.59 | 2.76% |
| 1989 | 5.24 | -6.26% |
| 1990 | 5.34 | 1.91% |
| 1991 | 5.69 | 6.55% |
| 1992 | 6.63 | 16.52% |
| 1993 | 6.75 | 1.81% |
| 1994 | 7.22 | 6.96% |
| 1995 | 7.57 | 4.85% |
| 1996 | 9.16 | 21.00% |
| 1997 | 10.01 | 9.28% |
| 1998 | 10.33 | 3.20% |
| 1999 | 11.05 | 6.97% |
| 2000 | 11.93 | 7.96% |
| 2001 | 14.06 | 17.85% |
| 2002 | 15.70 | 11.66% |
| 2003 | 17.61 | 12.17% |
| 2004 | 18.50 | 5.05% |
| 2005 | 19.66 | 6.27% |
| 2006 | 20.55 | 4.53% |
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