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| year | consumption | change |
| 1986 | 1.20 | NA |
| 1987 | 1.20 | 0.00% |
| 1988 | 2.00 | 66.67% |
| 1989 | 1.80 | -10.00% |
| 1990 | 2.10 | 16.67% |
| 1991 | 2.10 | 0.00% |
| 1992 | 2.20 | 4.76% |
| 1993 | 2.20 | 0.00% |
| 1994 | 2.20 | 0.00% |
| 1995 | 2.20 | 0.00% |
| 1996 | 2.30 | 4.55% |
| 1997 | 2.40 | 4.35% |
| 1998 | 2.70 | 12.50% |
| 1999 | 2.70 | 0.00% |
| 2000 | 2.80 | 3.70% |
| 2001 | 3.50 | 25.00% |
| 2002 | 3.80 | 8.57% |
| 2003 | 4.20 | 10.53% |
| 2004 | 4.40 | 4.76% |
| 2005 | 4.50 | 2.27% |
| 2006 | 6.90 | 53.33% |
| 2007 | 7.40 | 7.25% |
| 2008 | 12.00 | 62.16% |
| 2009 | 12.00 | 0.00% |
| 2010 | 12.00 | 0.00% |
| 2011 | 12.00 | 0.00% |
| 2012 | 12.00 | 0.00% |
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