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| year | consumption | change |
| 1986 | 16.00 | NA |
| 1987 | 19.00 | 18.75% |
| 1988 | 15.00 | -21.05% |
| 1989 | 7.60 | -49.33% |
| 1990 | 7.20 | -5.26% |
| 1991 | 20.00 | 177.78% |
| 1992 | 16.00 | -20.00% |
| 1993 | 23.00 | 43.75% |
| 1994 | 25.00 | 8.70% |
| 1995 | 21.00 | -16.00% |
| 1996 | 27.00 | 28.57% |
| 1997 | 32.00 | 18.52% |
| 1998 | 29.00 | -9.38% |
| 1999 | 28.00 | -3.45% |
| 2000 | 27.00 | -3.57% |
| 2001 | 32.00 | 18.52% |
| 2002 | 29.00 | -9.38% |
| 2003 | 27.00 | -6.90% |
| 2004 | 25.00 | -7.41% |
| 2005 | 22.00 | -12.00% |
| 2006 | 19.00 | -13.64% |
| 2007 | 20.00 | 5.26% |
| 2008 | 23.00 | 15.00% |
| 2009 | 26.00 | 13.04% |
| 2010 | 25.00 | -3.85% |
| 2011 | 25.00 | 0.00% |
| 2012 | 21.00 | -16.00% |
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