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| year | consumption | change |
| 1986 | 3.20 | NA |
| 1987 | 4.40 | 37.50% |
| 1988 | 3.60 | -18.18% |
| 1989 | 3.60 | 0.00% |
| 1990 | 3.60 | 0.00% |
| 1991 | 3.80 | 5.56% |
| 1992 | 3.70 | -2.63% |
| 1993 | 4.10 | 10.81% |
| 1994 | 4.10 | 0.00% |
| 1995 | 4.10 | 0.00% |
| 1996 | 4.10 | 0.00% |
| 1997 | 4.20 | 2.44% |
| 1998 | 4.20 | 0.00% |
| 1999 | 4.20 | 0.00% |
| 2000 | 4.50 | 7.14% |
| 2001 | 4.80 | 6.67% |
| 2002 | 4.80 | 0.00% |
| 2003 | 5.20 | 8.33% |
| 2004 | 5.20 | 0.00% |
| 2005 | 5.40 | 3.85% |
| 2006 | 5.60 | 3.70% |
| 2007 | 5.50 | -1.79% |
| 2008 | 5.50 | 0.00% |
| 2009 | 5.60 | 1.82% |
| 2010 | 6.90 | 23.21% |
| 2011 | 6.90 | 0.00% |
| 2012 | 6.90 | 0.00% |
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