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| year | consumption | change |
| 1986 | 6.80 | NA |
| 1987 | 6.90 | 1.47% |
| 1988 | 6.50 | -5.80% |
| 1989 | 6.60 | 1.54% |
| 1990 | 6.70 | 1.52% |
| 1991 | 6.30 | -5.97% |
| 1992 | 2.50 | -60.32% |
| 1993 | 2.50 | 0.00% |
| 1994 | 2.40 | -4.00% |
| 1995 | 2.30 | -4.17% |
| 1996 | 2.20 | -4.35% |
| 1997 | 2.10 | -4.55% |
| 1998 | 2.00 | -4.76% |
| 1999 | 2.00 | 0.00% |
| 2000 | 1.90 | -5.00% |
| 2001 | 1.80 | -5.26% |
| 2002 | 1.90 | 5.56% |
| 2003 | 1.50 | -21.05% |
| 2004 | 1.70 | 13.33% |
| 2005 | 1.90 | 11.76% |
| 2006 | 1.80 | -5.26% |
| 2007 | 1.90 | 5.56% |
| 2008 | 2.50 | 31.58% |
| 2009 | 10.00 | 300.00% |
| 2010 | 15.00 | 50.00% |
| 2011 | 15.00 | 0.00% |
| 2012 | 15.00 | 0.00% |
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