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| year | consumption | change |
| 1980 | 28.00 | NA |
| 1981 | 29.00 | 3.57% |
| 1982 | 25.00 | -13.79% |
| 1983 | 19.00 | -24.00% |
| 1984 | 17.00 | -10.53% |
| 1985 | 15.00 | -11.76% |
| 1986 | 15.00 | 0.00% |
| 1987 | 17.00 | 13.33% |
| 1988 | 16.00 | -5.88% |
| 1989 | 18.00 | 12.50% |
| 1990 | 19.00 | 5.56% |
| 1991 | 17.00 | -10.53% |
| 1992 | 15.00 | -11.76% |
| 1993 | 16.00 | 6.67% |
| 1994 | 17.00 | 6.25% |
| 1995 | 20.00 | 17.65% |
| 1996 | 22.00 | 10.00% |
| 1997 | 22.00 | 0.00% |
| 1998 | 25.00 | 13.64% |
| 1999 | 22.00 | -12.00% |
| 2000 | 22.00 | 0.00% |
| 2001 | 22.00 | 0.00% |
| 2002 | 22.00 | 0.00% |
| 2003 | 27.00 | 22.73% |
| 2004 | 27.00 | 0.00% |
| 2005 | 31.00 | 14.81% |
| 2006 | 31.00 | 0.00% |
| 2007 | 29.00 | -6.45% |
| 2008 | 20.00 | -31.03% |
| 2009 | 23.00 | 15.00% |
| 2010 | 23.00 | 0.00% |
| 2011 | 23.00 | 0.00% |
| 2012 | 23.00 | 0.00% |
| 2013 | 23.00 | 0.00% |
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