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| year | consumption | change |
| 1980 | 4.70 | NA |
| 1981 | 5.70 | 21.28% |
| 1982 | 5.90 | 3.51% |
| 1983 | 6.10 | 3.39% |
| 1984 | 6.00 | -1.64% |
| 1985 | 6.40 | 6.67% |
| 1986 | 8.30 | 29.69% |
| 1987 | 7.30 | -12.05% |
| 1988 | 7.30 | 0.00% |
| 1989 | 8.30 | 13.70% |
| 1990 | 8.00 | -3.61% |
| 1991 | 8.20 | 2.50% |
| 1992 | 8.40 | 2.44% |
| 1993 | 8.30 | -1.19% |
| 1994 | 8.00 | -3.61% |
| 1995 | 7.90 | -1.25% |
| 1996 | 7.60 | -3.80% |
| 1997 | 7.90 | 3.95% |
| 1998 | 8.60 | 8.86% |
| 1999 | 8.40 | -2.33% |
| 2000 | 8.50 | 1.19% |
| 2001 | 8.80 | 3.53% |
| 2002 | 14.00 | 59.09% |
| 2003 | 13.00 | -7.14% |
| 2004 | 16.00 | 23.08% |
| 2005 | 17.00 | 6.25% |
| 2006 | 15.00 | -11.76% |
| 2007 | 19.00 | 26.67% |
| 2008 | 18.00 | -5.26% |
| 2009 | 18.00 | 0.00% |
| 2010 | 20.00 | 11.11% |
| 2011 | 23.00 | 15.00% |
| 2012 | 25.00 | 8.70% |
| 2013 | 23.00 | -8.00% |
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