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| year | consumption | change |
| 1980 | 22.00 | NA |
| 1981 | 22.00 | 0.00% |
| 1982 | 23.00 | 4.55% |
| 1983 | 23.00 | 0.00% |
| 1984 | 23.00 | 0.00% |
| 1985 | 24.00 | 4.35% |
| 1986 | 27.00 | 12.50% |
| 1987 | 28.00 | 3.70% |
| 1988 | 28.00 | 0.00% |
| 1989 | 28.00 | 0.00% |
| 1990 | 29.00 | 3.57% |
| 1991 | 30.00 | 3.45% |
| 1992 | 30.00 | 0.00% |
| 1993 | 31.00 | 3.33% |
| 1994 | 31.00 | 0.00% |
| 1995 | 31.00 | 0.00% |
| 1996 | 32.00 | 3.23% |
| 1997 | 32.00 | 0.00% |
| 1998 | 32.00 | 0.00% |
| 1999 | 33.00 | 3.13% |
| 2000 | 33.00 | 0.00% |
| 2001 | 33.00 | 0.00% |
| 2002 | 33.00 | 0.00% |
| 2003 | 33.00 | 0.00% |
| 2004 | 34.00 | 3.03% |
| 2005 | 35.00 | 2.94% |
| 2006 | 35.00 | 0.00% |
| 2007 | 35.00 | 0.00% |
| 2008 | 34.00 | -2.86% |
| 2009 | 32.00 | -5.88% |
| 2010 | 33.00 | 3.13% |
| 2011 | 32.00 | -3.03% |
| 2012 | 32.00 | 0.00% |
| 2013 | 33.00 | 3.13% |
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