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| year | consumption | change |
| 1986 | 5.90 | NA |
| 1987 | 5.90 | 0.00% |
| 1988 | 6.40 | 8.47% |
| 1989 | 8.40 | 31.25% |
| 1990 | 7.60 | -9.52% |
| 1991 | 8.20 | 7.89% |
| 1992 | 8.70 | 6.10% |
| 1993 | 9.10 | 4.60% |
| 1994 | 9.90 | 8.79% |
| 1995 | 10.00 | 1.01% |
| 1996 | 10.00 | 0.00% |
| 1997 | 11.00 | 10.00% |
| 1998 | 11.00 | 0.00% |
| 1999 | 8.60 | -21.82% |
| 2000 | 12.00 | 39.53% |
| 2001 | 13.00 | 8.33% |
| 2002 | 11.00 | -15.38% |
| 2003 | 12.00 | 9.09% |
| 2004 | 12.00 | 0.00% |
| 2005 | 12.00 | 0.00% |
| 2006 | 15.00 | 25.00% |
| 2007 | 15.00 | 0.00% |
| 2008 | 15.00 | 0.00% |
| 2009 | 15.00 | 0.00% |
| 2010 | 16.00 | 6.67% |
| 2011 | 15.00 | -6.25% |
| 2012 | 15.00 | 0.00% |
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