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| year | consumption | change |
| 1980 | 1.85 | NA |
| 1981 | 1.84 | -0.54% |
| 1982 | 2.06 | 11.96% |
| 1983 | 2.14 | 3.88% |
| 1984 | 2.32 | 8.41% |
| 1985 | 2.45 | 5.60% |
| 1986 | 2.69 | 9.80% |
| 1987 | 2.87 | 6.69% |
| 1988 | 3.47 | 20.91% |
| 1989 | 4.13 | 19.02% |
| 1990 | 4.13 | 0.00% |
| 1991 | 4.31 | 4.36% |
| 1992 | 4.34 | 0.70% |
| 1993 | 4.46 | 2.76% |
| 1994 | 4.80 | 7.62% |
| 1995 | 5.34 | 11.25% |
| 1996 | 5.74 | 7.49% |
| 1997 | 6.16 | 7.32% |
| 1998 | 7.52 | 22.08% |
| 1999 | 7.86 | 4.52% |
| 2000 | 9.15 | 16.41% |
| 2001 | 10.43 | 13.99% |
| 2002 | 11.17 | 7.09% |
| 2003 | 11.33 | 1.43% |
| 2004 | 12.20 | 7.68% |
| 2005 | 13.17 | 7.95% |
| 2006 | 14.38 | 9.19% |
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