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| year | consumption | change |
| 1986 | 3.30 | NA |
| 1987 | 3.10 | -6.06% |
| 1988 | 4.40 | 41.94% |
| 1989 | 6.30 | 43.18% |
| 1990 | 6.70 | 6.35% |
| 1991 | 5.50 | -17.91% |
| 1992 | 6.10 | 10.91% |
| 1993 | 6.50 | 6.56% |
| 1994 | 9.00 | 38.46% |
| 1995 | 9.60 | 6.67% |
| 1996 | 11.00 | 14.58% |
| 1997 | 9.60 | -12.73% |
| 1998 | 11.00 | 14.58% |
| 1999 | 12.00 | 9.09% |
| 2000 | 6.10 | -49.17% |
| 2001 | 6.80 | 11.48% |
| 2002 | 8.50 | 25.00% |
| 2003 | 11.00 | 29.41% |
| 2004 | 11.00 | 0.00% |
| 2005 | 11.00 | 0.00% |
| 2006 | 16.00 | 45.45% |
| 2007 | 18.00 | 12.50% |
| 2008 | 12.00 | -33.33% |
| 2009 | 10.00 | -16.67% |
| 2010 | 9.30 | -7.00% |
| 2011 | 10.00 | 7.53% |
| 2012 | 9.30 | -7.00% |
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