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| year | consumption | change |
| 1986 | 4.20 | NA |
| 1987 | 4.60 | 9.52% |
| 1988 | 4.80 | 4.35% |
| 1989 | 5.30 | 10.42% |
| 1990 | 5.50 | 3.77% |
| 1991 | 5.80 | 5.45% |
| 1992 | 6.00 | 3.45% |
| 1993 | 6.40 | 6.67% |
| 1994 | 6.60 | 3.13% |
| 1995 | 7.20 | 9.09% |
| 1996 | 11.00 | 52.78% |
| 1997 | 11.00 | 0.00% |
| 1998 | 10.00 | -9.09% |
| 1999 | 10.00 | 0.00% |
| 2000 | 11.00 | 10.00% |
| 2001 | 11.00 | 0.00% |
| 2002 | 11.00 | 0.00% |
| 2003 | 11.00 | 0.00% |
| 2004 | 12.00 | 9.09% |
| 2005 | 11.00 | -8.33% |
| 2006 | 12.00 | 9.09% |
| 2007 | 14.00 | 16.67% |
| 2008 | 12.00 | -14.29% |
| 2009 | 12.00 | 0.00% |
| 2010 | 11.00 | -8.33% |
| 2011 | 11.00 | 0.00% |
| 2012 | 10.00 | -9.09% |
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