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| year | consumption | change |
| 1986 | 22.00 | NA |
| 1987 | 21.00 | -4.55% |
| 1988 | 23.00 | 9.52% |
| 1989 | 21.00 | -8.70% |
| 1990 | 24.00 | 14.29% |
| 1991 | 25.00 | 4.17% |
| 1992 | 22.00 | -12.00% |
| 1993 | 16.00 | -27.27% |
| 1994 | 15.00 | -6.25% |
| 1995 | 16.00 | 6.67% |
| 1996 | 16.00 | 0.00% |
| 1997 | 17.00 | 6.25% |
| 1998 | 18.00 | 5.88% |
| 1999 | 13.00 | -27.78% |
| 2000 | 11.00 | -15.38% |
| 2001 | 11.00 | 0.00% |
| 2002 | 13.00 | 18.18% |
| 2003 | 11.00 | -15.38% |
| 2004 | 20.00 | 81.82% |
| 2005 | 22.00 | 10.00% |
| 2006 | 23.00 | 4.55% |
| 2007 | 27.00 | 17.39% |
| 2008 | 28.00 | 3.70% |
| 2009 | 32.00 | 14.29% |
| 2010 | 26.00 | -18.75% |
| 2011 | 21.00 | -19.23% |
| 2012 | 18.00 | -14.29% |
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