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| year | consumption | change |
| 1986 | 15.00 | NA |
| 1987 | 25.00 | 66.67% |
| 1988 | 21.00 | -16.00% |
| 1989 | 25.00 | 19.05% |
| 1990 | 22.00 | -12.00% |
| 1991 | 23.00 | 4.55% |
| 1992 | 22.00 | -4.35% |
| 1993 | 21.00 | -4.55% |
| 1994 | 24.00 | 14.29% |
| 1995 | 27.00 | 12.50% |
| 1996 | 19.00 | -29.63% |
| 1997 | 17.00 | -10.53% |
| 1998 | 47.00 | 176.47% |
| 1999 | 73.00 | 55.32% |
| 2000 | 87.00 | 19.18% |
| 2001 | 71.00 | -18.39% |
| 2002 | 67.00 | -5.63% |
| 2003 | 58.00 | -13.43% |
| 2004 | 50.00 | -13.79% |
| 2005 | 52.00 | 4.00% |
| 2006 | 25.00 | -51.92% |
| 2007 | 23.00 | -8.00% |
| 2008 | 25.00 | 8.70% |
| 2009 | 28.00 | 12.00% |
| 2010 | 40.00 | 42.86% |
| 2011 | 51.00 | 27.50% |
| 2012 | 41.00 | -19.61% |
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