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| year | consumption | change |
| 1980 | 13.00 | NA |
| 1981 | 11.00 | -15.38% |
| 1982 | 13.00 | 18.18% |
| 1983 | 13.00 | 0.00% |
| 1984 | 12.00 | -7.69% |
| 1985 | 13.00 | 8.33% |
| 1986 | 6.60 | -49.23% |
| 1987 | 6.80 | 3.03% |
| 1988 | 9.80 | 44.12% |
| 1989 | 8.00 | -18.37% |
| 1990 | 7.00 | -12.50% |
| 1991 | 6.90 | -1.43% |
| 1992 | 6.90 | 0.00% |
| 1993 | 6.80 | -1.45% |
| 1994 | 6.50 | -4.41% |
| 1995 | 7.10 | 9.23% |
| 1996 | 7.00 | -1.41% |
| 1997 | 7.30 | 4.29% |
| 1998 | 7.60 | 4.11% |
| 1999 | 7.90 | 3.95% |
| 2000 | 7.80 | -1.27% |
| 2001 | 9.40 | 20.51% |
| 2002 | 11.00 | 17.02% |
| 2003 | 11.00 | 0.00% |
| 2004 | 13.00 | 18.18% |
| 2005 | 13.00 | 0.00% |
| 2006 | 14.00 | 7.69% |
| 2007 | 14.00 | 0.00% |
| 2008 | 13.00 | -7.14% |
| 2009 | 15.00 | 15.38% |
| 2010 | 16.00 | 6.67% |
| 2011 | 18.00 | 12.50% |
| 2012 | 18.00 | 0.00% |
| 2013 | 17.00 | -5.56% |
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