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| year | consumption | change |
| 1986 | 6.90 | NA |
| 1987 | 8.40 | 21.74% |
| 1988 | 9.70 | 15.48% |
| 1989 | 12.00 | 23.71% |
| 1990 | 13.00 | 8.33% |
| 1991 | 13.00 | 0.00% |
| 1992 | 15.00 | 15.38% |
| 1993 | 17.00 | 13.33% |
| 1994 | 22.00 | 29.41% |
| 1995 | 21.00 | -4.55% |
| 1996 | 40.00 | 90.48% |
| 1997 | 26.00 | -35.00% |
| 1998 | 31.00 | 19.23% |
| 1999 | 34.00 | 9.68% |
| 2000 | 34.00 | 0.00% |
| 2001 | 33.00 | -2.94% |
| 2002 | 34.00 | 3.03% |
| 2003 | 30.00 | -11.76% |
| 2004 | 32.00 | 6.67% |
| 2005 | 31.00 | -3.13% |
| 2006 | 31.00 | 0.00% |
| 2007 | 32.00 | 3.23% |
| 2008 | 32.00 | 0.00% |
| 2009 | 35.00 | 9.38% |
| 2010 | 35.00 | 0.00% |
| 2011 | 36.00 | 2.86% |
| 2012 | 35.00 | -2.78% |
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