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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 | | NA |
| 1992 | 1.79 | NA |
| 1993 | 1.70 | -5.03% |
| 1994 | 1.56 | -8.24% |
| 1995 | 1.53 | -1.92% |
| 1996 | 1.51 | -1.31% |
| 1997 | 1.48 | -1.99% |
| 1998 | 1.47 | -0.68% |
| 1999 | 2.00 | 36.05% |
| 2000 | 2.47 | 23.50% |
| 2001 | 2.81 | 13.77% |
| 2002 | 2.81 | 0.00% |
| 2003 | 2.03 | -27.76% |
| 2004 | 2.11 | 3.94% |
| 2005 | 2.90 | 37.44% |
| 2006 | 3.05 | 5.17% |
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