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| year | consumption | change |
| 1986 | 1.60 | NA |
| 1987 | 3.40 | 112.50% |
| 1988 | 3.40 | 0.00% |
| 1989 | 3.10 | -8.82% |
| 1990 | 3.00 | -3.23% |
| 1991 | 2.80 | -6.67% |
| 1992 | 3.20 | 14.29% |
| 1993 | 3.30 | 3.13% |
| 1994 | 3.30 | 0.00% |
| 1995 | 3.30 | 0.00% |
| 1996 | 3.30 | 0.00% |
| 1997 | 3.40 | 3.03% |
| 1998 | 3.40 | 0.00% |
| 1999 | 3.40 | 0.00% |
| 2000 | 4.90 | 44.12% |
| 2001 | 5.70 | 16.33% |
| 2002 | 6.10 | 7.02% |
| 2003 | 6.20 | 1.64% |
| 2004 | 8.50 | 37.10% |
| 2005 | 6.60 | -22.35% |
| 2006 | 9.10 | 37.88% |
| 2007 | 8.70 | -4.40% |
| 2008 | 7.50 | -13.79% |
| 2009 | 6.80 | -9.33% |
| 2010 | 6.80 | 0.00% |
| 2011 | 6.80 | 0.00% |
| 2012 | 6.80 | 0.00% |
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