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| year | consumption | change |
| 1986 | 3.00 | NA |
| 1987 | 3.40 | 13.33% |
| 1988 | 3.40 | 0.00% |
| 1989 | 3.40 | 0.00% |
| 1990 | 4.00 | 17.65% |
| 1991 | 3.40 | -15.00% |
| 1992 | 3.00 | -11.76% |
| 1993 | 3.10 | 3.33% |
| 1994 | 3.10 | 0.00% |
| 1995 | 3.10 | 0.00% |
| 1996 | 3.10 | 0.00% |
| 1997 | 3.10 | 0.00% |
| 1998 | 3.10 | 0.00% |
| 1999 | 3.10 | 0.00% |
| 2000 | 3.20 | 3.23% |
| 2001 | 3.20 | 0.00% |
| 2002 | 3.20 | 0.00% |
| 2003 | 3.20 | 0.00% |
| 2004 | 3.30 | 3.13% |
| 2005 | 3.40 | 3.03% |
| 2006 | 3.30 | -2.94% |
| 2007 | 3.30 | 0.00% |
| 2008 | 3.40 | 3.03% |
| 2009 | 3.40 | 0.00% |
| 2010 | 3.40 | 0.00% |
| 2011 | 3.40 | 0.00% |
| 2012 | 3.40 | 0.00% |
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