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| year | consumption | change |
| 1980 | 5.00 | NA |
| 1981 | 3.20 | -36.00% |
| 1982 | 3.80 | 18.75% |
| 1983 | 3.70 | -2.63% |
| 1984 | 3.80 | 2.70% |
| 1985 | 4.10 | 7.89% |
| 1986 | 4.50 | 9.76% |
| 1987 | 3.90 | -13.33% |
| 1988 | 5.90 | 51.28% |
| 1989 | 5.40 | -8.47% |
| 1990 | 5.80 | 7.41% |
| 1991 | 6.40 | 10.34% |
| 1992 | 6.60 | 3.13% |
| 1993 | 6.80 | 3.03% |
| 1994 | 7.00 | 2.94% |
| 1995 | 7.00 | 0.00% |
| 1996 | 7.00 | 0.00% |
| 1997 | 7.20 | 2.86% |
| 1998 | 8.30 | 15.28% |
| 1999 | 8.30 | 0.00% |
| 2000 | 8.60 | 3.61% |
| 2001 | 9.50 | 10.47% |
| 2002 | 9.90 | 4.21% |
| 2003 | 11.00 | 11.11% |
| 2004 | 11.00 | 0.00% |
| 2005 | 11.00 | 0.00% |
| 2006 | 13.00 | 18.18% |
| 2007 | 14.00 | 7.69% |
| 2008 | 24.00 | 71.43% |
| 2009 | 22.00 | -8.33% |
| 2010 | 23.00 | 4.55% |
| 2011 | 22.00 | -4.35% |
| 2012 | 22.00 | 0.00% |
| 2013 | 22.00 | 0.00% |
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