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| year | consumption | change |
| 1980 | 4.80 | NA |
| 1981 | 5.00 | 4.17% |
| 1982 | 4.00 | -20.00% |
| 1983 | 5.00 | 25.00% |
| 1984 | 5.60 | 12.00% |
| 1985 | 6.40 | 14.29% |
| 1986 | 5.50 | -14.06% |
| 1987 | 6.20 | 12.73% |
| 1988 | 6.30 | 1.61% |
| 1989 | 6.80 | 7.94% |
| 1990 | 7.40 | 8.82% |
| 1991 | 7.70 | 4.05% |
| 1992 | 8.40 | 9.09% |
| 1993 | 9.20 | 9.52% |
| 1994 | 11.00 | 19.57% |
| 1995 | 11.00 | 0.00% |
| 1996 | 13.00 | 18.18% |
| 1997 | 13.00 | 0.00% |
| 1998 | 13.00 | 0.00% |
| 1999 | 12.00 | -7.69% |
| 2000 | 13.00 | 8.33% |
| 2001 | 13.00 | 0.00% |
| 2002 | 13.00 | 0.00% |
| 2003 | 13.00 | 0.00% |
| 2004 | 13.00 | 0.00% |
| 2005 | 14.00 | 7.69% |
| 2006 | 14.00 | 0.00% |
| 2007 | 15.00 | 7.14% |
| 2008 | 17.00 | 13.33% |
| 2009 | 17.00 | 0.00% |
| 2010 | 17.00 | 0.00% |
| 2011 | 18.00 | 5.88% |
| 2012 | 18.00 | 0.00% |
| 2013 | 18.00 | 0.00% |
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