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| year | consumption | change |
| 1986 | 5.40 | NA |
| 1987 | 6.10 | 12.96% |
| 1988 | 6.60 | 8.20% |
| 1989 | 6.80 | 3.03% |
| 1990 | 7.30 | 7.35% |
| 1991 | 6.60 | -9.59% |
| 1992 | 8.20 | 24.24% |
| 1993 | 9.10 | 10.98% |
| 1994 | 9.50 | 4.40% |
| 1995 | 8.60 | -9.47% |
| 1996 | 13.00 | 51.16% |
| 1997 | 13.00 | 0.00% |
| 1998 | 15.00 | 15.38% |
| 1999 | 16.00 | 6.67% |
| 2000 | 18.00 | 12.50% |
| 2001 | 19.00 | 5.56% |
| 2002 | 19.00 | 0.00% |
| 2003 | 18.00 | -5.26% |
| 2004 | 19.00 | 5.56% |
| 2005 | 19.00 | 0.00% |
| 2006 | 20.00 | 5.26% |
| 2007 | 21.00 | 5.00% |
| 2008 | 21.00 | 0.00% |
| 2009 | 23.00 | 9.52% |
| 2010 | 22.00 | -4.35% |
| 2011 | 22.00 | 0.00% |
| 2012 | 22.00 | 0.00% |
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