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| year | consumption | change |
| 1986 | 5.10 | NA |
| 1987 | 5.10 | 0.00% |
| 1988 | 5.60 | 9.80% |
| 1989 | 5.80 | 3.57% |
| 1990 | 6.20 | 6.90% |
| 1991 | 4.30 | -30.65% |
| 1992 | 6.70 | 55.81% |
| 1993 | 6.80 | 1.49% |
| 1994 | 7.50 | 10.29% |
| 1995 | 7.70 | 2.67% |
| 1996 | 7.60 | -1.30% |
| 1997 | 8.40 | 10.53% |
| 1998 | 8.10 | -3.57% |
| 1999 | 7.00 | -13.58% |
| 2000 | 9.10 | 30.00% |
| 2001 | 9.60 | 5.49% |
| 2002 | 9.90 | 3.12% |
| 2003 | 11.00 | 11.11% |
| 2004 | 9.60 | -12.73% |
| 2005 | 10.00 | 4.17% |
| 2006 | 9.50 | -5.00% |
| 2007 | 9.80 | 3.16% |
| 2008 | 9.90 | 1.02% |
| 2009 | 10.00 | 1.01% |
| 2010 | 11.00 | 10.00% |
| 2011 | 12.00 | 9.09% |
| 2012 | 12.00 | 0.00% |
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