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| year | consumption | change |
| 1980 | 2.60 | NA |
| 1981 | 2.60 | 0.00% |
| 1982 | 2.70 | 3.85% |
| 1983 | 2.70 | 0.00% |
| 1984 | 2.70 | 0.00% |
| 1985 | 2.60 | -3.70% |
| 1986 | 2.70 | 3.85% |
| 1987 | 2.70 | 0.00% |
| 1988 | 2.70 | 0.00% |
| 1989 | 2.60 | -3.70% |
| 1990 | 2.70 | 3.85% |
| 1991 | 2.70 | 0.00% |
| 1992 | 3.10 | 14.81% |
| 1993 | 4.00 | 29.03% |
| 1994 | 4.20 | 5.00% |
| 1995 | 4.40 | 4.76% |
| 1996 | 6.40 | 45.45% |
| 1997 | 7.50 | 17.19% |
| 1998 | 7.60 | 1.33% |
| 1999 | 7.50 | -1.32% |
| 2000 | 9.20 | 22.67% |
| 2001 | 9.30 | 1.09% |
| 2002 | 10.00 | 7.53% |
| 2003 | 11.00 | 10.00% |
| 2004 | 10.00 | -9.09% |
| 2005 | 11.00 | 10.00% |
| 2006 | 10.00 | -9.09% |
| 2007 | 11.00 | 10.00% |
| 2008 | 11.00 | 0.00% |
| 2009 | 12.00 | 9.09% |
| 2010 | 14.00 | 16.67% |
| 2011 | 14.00 | 0.00% |
| 2012 | 13.00 | -7.14% |
| 2013 | 16.00 | 23.08% |
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