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| year | consumption | change |
| 1986 | 12.00 | NA |
| 1987 | 14.00 | 16.67% |
| 1988 | 16.00 | 14.29% |
| 1989 | 13.00 | -18.75% |
| 1990 | 16.00 | 23.08% |
| 1991 | 16.00 | 0.00% |
| 1992 | 24.00 | 50.00% |
| 1993 | 17.00 | -29.17% |
| 1994 | 20.00 | 17.65% |
| 1995 | 26.00 | 30.00% |
| 1996 | 26.00 | 0.00% |
| 1997 | 27.00 | 3.85% |
| 1998 | 28.00 | 3.70% |
| 1999 | 23.00 | -17.86% |
| 2000 | 25.00 | 8.70% |
| 2001 | 27.00 | 8.00% |
| 2002 | 38.00 | 40.74% |
| 2003 | 32.00 | -15.79% |
| 2004 | 30.00 | -6.25% |
| 2005 | 29.00 | -3.33% |
| 2006 | 30.00 | 3.45% |
| 2007 | 34.00 | 13.33% |
| 2008 | 32.00 | -5.88% |
| 2009 | 28.00 | -12.50% |
| 2010 | 28.00 | 0.00% |
| 2011 | 27.00 | -3.57% |
| 2012 | 25.00 | -7.41% |
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