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| year | consumption | change |
| 1986 | 19.00 | NA |
| 1987 | 24.00 | 26.32% |
| 1988 | 35.00 | 45.83% |
| 1989 | 34.00 | -2.86% |
| 1990 | 35.00 | 2.94% |
| 1991 | 38.00 | 8.57% |
| 1992 | 30.00 | -21.05% |
| 1993 | 29.00 | -3.33% |
| 1994 | 28.00 | -3.45% |
| 1995 | 29.00 | 3.57% |
| 1996 | 14.00 | -51.72% |
| 1997 | 33.00 | 135.71% |
| 1998 | 21.00 | -36.36% |
| 1999 | 32.00 | 52.38% |
| 2000 | 33.00 | 3.13% |
| 2001 | 31.00 | -6.06% |
| 2002 | 27.00 | -12.90% |
| 2003 | 40.00 | 48.15% |
| 2004 | 16.00 | -60.00% |
| 2005 | 24.00 | 50.00% |
| 2006 | 22.00 | -8.33% |
| 2007 | 19.00 | -13.64% |
| 2008 | 16.00 | -15.79% |
| 2009 | 20.00 | 25.00% |
| 2010 | 26.00 | 30.00% |
| 2011 | 31.00 | 19.23% |
| 2012 | 19.00 | -38.71% |
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