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| year | consumption | change |
| 1986 | 2.00 | NA |
| 1987 | 1.30 | -35.00% |
| 1988 | 2.10 | 61.54% |
| 1989 | 1.70 | -19.05% |
| 1990 | 1.50 | -11.76% |
| 1991 | 1.30 | -13.33% |
| 1992 | 1.30 | 0.00% |
| 1993 | 1.30 | 0.00% |
| 1994 | 1.60 | 23.08% |
| 1995 | 1.60 | 0.00% |
| 1996 | 1.60 | 0.00% |
| 1997 | 1.60 | 0.00% |
| 1998 | 1.60 | 0.00% |
| 1999 | 1.60 | 0.00% |
| 2000 | 1.60 | 0.00% |
| 2001 | 1.60 | 0.00% |
| 2002 | 1.70 | 6.25% |
| 2003 | 1.80 | 5.88% |
| 2004 | 1.80 | 0.00% |
| 2005 | 1.80 | 0.00% |
| 2006 | 2.60 | 44.44% |
| 2007 | 2.70 | 3.85% |
| 2008 | 4.40 | 62.96% |
| 2009 | 3.10 | -29.55% |
| 2010 | 3.30 | 6.45% |
| 2011 | 3.10 | -6.06% |
| 2012 | 3.10 | 0.00% |
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