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| year | consumption | change |
| 1986 | 4.50 | NA |
| 1987 | 4.90 | 8.89% |
| 1988 | 5.10 | 4.08% |
| 1989 | 5.70 | 11.76% |
| 1990 | 7.10 | 24.56% |
| 1991 | 6.40 | -9.86% |
| 1992 | 8.80 | 37.50% |
| 1993 | 8.30 | -5.68% |
| 1994 | 8.40 | 1.20% |
| 1995 | 7.90 | -5.95% |
| 1996 | 7.10 | -10.13% |
| 1997 | 10.00 | 40.85% |
| 1998 | 11.00 | 10.00% |
| 1999 | 12.00 | 9.09% |
| 2000 | 11.00 | -8.33% |
| 2001 | 12.00 | 9.09% |
| 2002 | 11.00 | -8.33% |
| 2003 | 11.00 | 0.00% |
| 2004 | 13.00 | 18.18% |
| 2005 | 13.00 | 0.00% |
| 2006 | 13.00 | 0.00% |
| 2007 | 13.00 | 0.00% |
| 2008 | 13.00 | 0.00% |
| 2009 | 13.00 | 0.00% |
| 2010 | 13.00 | 0.00% |
| 2011 | 13.00 | 0.00% |
| 2012 | 14.00 | 7.69% |
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