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| year | consumption | change |
| 1986 | 5.20 | NA |
| 1987 | 6.50 | 25.00% |
| 1988 | 5.30 | -18.46% |
| 1989 | 4.70 | -11.32% |
| 1990 | 4.80 | 2.13% |
| 1991 | 4.20 | -12.50% |
| 1992 | 4.20 | 0.00% |
| 1993 | 4.10 | -2.38% |
| 1994 | 4.80 | 17.07% |
| 1995 | 4.90 | 2.08% |
| 1996 | 5.30 | 8.16% |
| 1997 | 6.00 | 13.21% |
| 1998 | 6.50 | 8.33% |
| 1999 | 5.60 | -13.85% |
| 2000 | 11.00 | 96.43% |
| 2001 | 10.00 | -9.09% |
| 2002 | 11.00 | 10.00% |
| 2003 | 11.00 | 0.00% |
| 2004 | 12.00 | 9.09% |
| 2005 | 13.00 | 8.33% |
| 2006 | 12.00 | -7.69% |
| 2007 | 11.00 | -8.33% |
| 2008 | 11.00 | 0.00% |
| 2009 | 9.90 | -10.00% |
| 2010 | 11.00 | 11.11% |
| 2011 | 12.00 | 9.09% |
| 2012 | 12.00 | 0.00% |
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