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| year | consumption | change |
| 1986 | 5.60 | NA |
| 1987 | 5.50 | -1.79% |
| 1988 | 6.30 | 14.55% |
| 1989 | 6.50 | 3.17% |
| 1990 | 6.40 | -1.54% |
| 1991 | 7.10 | 10.94% |
| 1992 | 6.90 | -2.82% |
| 1993 | 6.50 | -5.80% |
| 1994 | 8.40 | 29.23% |
| 1995 | 8.50 | 1.19% |
| 1996 | 11.00 | 29.41% |
| 1997 | 15.00 | 36.36% |
| 1998 | 17.00 | 13.33% |
| 1999 | 24.00 | 41.18% |
| 2000 | 22.00 | -8.33% |
| 2001 | 18.00 | -18.18% |
| 2002 | 20.00 | 11.11% |
| 2003 | 21.00 | 5.00% |
| 2004 | 25.00 | 19.05% |
| 2005 | 26.00 | 4.00% |
| 2006 | 23.00 | -11.54% |
| 2007 | 23.00 | 0.00% |
| 2008 | 16.00 | -30.43% |
| 2009 | 12.00 | -25.00% |
| 2010 | 10.00 | -16.67% |
| 2011 | 8.80 | -12.00% |
| 2012 | 3.80 | -56.82% |
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