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| year | consumption | change |
| 1986 | 22.00 | NA |
| 1987 | 17.00 | -22.73% |
| 1988 | 17.00 | 0.00% |
| 1989 | 14.00 | -17.65% |
| 1990 | 13.00 | -7.14% |
| 1991 | 10.00 | -23.08% |
| 1992 | 9.20 | -8.00% |
| 1993 | 9.30 | 1.09% |
| 1994 | 12.00 | 29.03% |
| 1995 | 12.00 | 0.00% |
| 1996 | 15.00 | 25.00% |
| 1997 | 15.00 | 0.00% |
| 1998 | 13.00 | -13.33% |
| 1999 | 12.00 | -7.69% |
| 2000 | 10.00 | -16.67% |
| 2001 | 11.00 | 10.00% |
| 2002 | 8.50 | -22.73% |
| 2003 | 10.00 | 17.65% |
| 2004 | 10.00 | 0.00% |
| 2005 | 10.00 | 0.00% |
| 2006 | 8.90 | -11.00% |
| 2007 | 11.00 | 23.60% |
| 2008 | 8.40 | -23.64% |
| 2009 | 8.10 | -3.57% |
| 2010 | 7.10 | -12.35% |
| 2011 | 5.80 | -18.31% |
| 2012 | 4.80 | -17.24% |
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