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| year | consumption | change |
| 1980 | 8.00 | NA |
| 1981 | 7.00 | -12.50% |
| 1982 | 6.00 | -14.29% |
| 1983 | 8.00 | 33.33% |
| 1984 | 8.00 | 0.00% |
| 1985 | 8.60 | 7.50% |
| 1986 | 5.70 | -33.72% |
| 1987 | 8.30 | 45.61% |
| 1988 | 9.10 | 9.64% |
| 1989 | 6.50 | -28.57% |
| 1990 | 6.30 | -3.08% |
| 1991 | 6.50 | 3.17% |
| 1992 | 7.00 | 7.69% |
| 1993 | 7.30 | 4.29% |
| 1994 | 8.10 | 10.96% |
| 1995 | 8.40 | 3.70% |
| 1996 | 8.40 | 0.00% |
| 1997 | 8.50 | 1.19% |
| 1998 | 8.60 | 1.18% |
| 1999 | 8.60 | 0.00% |
| 2000 | 12.00 | 39.53% |
| 2001 | 13.00 | 8.33% |
| 2002 | 15.00 | 15.38% |
| 2003 | 16.00 | 6.67% |
| 2004 | 17.00 | 6.25% |
| 2005 | 17.00 | 0.00% |
| 2006 | 17.00 | 0.00% |
| 2007 | 16.00 | -5.88% |
| 2008 | 14.00 | -12.50% |
| 2009 | 12.00 | -14.29% |
| 2010 | 12.00 | 0.00% |
| 2011 | 12.00 | 0.00% |
| 2012 | 12.00 | 0.00% |
| 2013 | 12.00 | 0.00% |
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