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| year | consumption | change |
| 1980 | 14.00 | NA |
| 1981 | 12.00 | -14.29% |
| 1982 | 11.00 | -8.33% |
| 1983 | 8.00 | -27.27% |
| 1984 | 6.70 | -16.25% |
| 1985 | 8.60 | 28.36% |
| 1986 | 8.50 | -1.16% |
| 1987 | 7.20 | -15.29% |
| 1988 | 7.90 | 9.72% |
| 1989 | 8.70 | 10.13% |
| 1990 | 11.00 | 26.44% |
| 1991 | 9.70 | -11.82% |
| 1992 | 9.20 | -5.15% |
| 1993 | 9.60 | 4.35% |
| 1994 | 9.40 | -2.08% |
| 1995 | 9.70 | 3.19% |
| 1996 | 9.50 | -2.06% |
| 1997 | 9.80 | 3.16% |
| 1998 | 9.90 | 1.02% |
| 1999 | 9.90 | 0.00% |
| 2000 | 10.00 | 1.01% |
| 2001 | 11.00 | 10.00% |
| 2002 | 11.00 | 0.00% |
| 2003 | 12.00 | 9.09% |
| 2004 | 12.00 | 0.00% |
| 2005 | 13.00 | 8.33% |
| 2006 | 13.00 | 0.00% |
| 2007 | 13.00 | 0.00% |
| 2008 | 13.00 | 0.00% |
| 2009 | 13.00 | 0.00% |
| 2010 | 17.00 | 30.77% |
| 2011 | 17.00 | 0.00% |
| 2012 | 17.00 | 0.00% |
| 2013 | 17.00 | 0.00% |
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