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| year | consumption | change |
| 1986 | 1.40 | NA |
| 1987 | 1.80 | 28.57% |
| 1988 | 2.20 | 22.22% |
| 1989 | 2.50 | 13.64% |
| 1990 | 2.70 | 8.00% |
| 1991 | 3.20 | 18.52% |
| 1992 | 4.00 | 25.00% |
| 1993 | 3.90 | -2.50% |
| 1994 | 3.90 | 0.00% |
| 1995 | 3.90 | 0.00% |
| 1996 | 3.90 | 0.00% |
| 1997 | 4.70 | 20.51% |
| 1998 | 5.20 | 10.64% |
| 1999 | 5.20 | 0.00% |
| 2000 | 8.00 | 53.85% |
| 2001 | 5.00 | -37.50% |
| 2002 | 5.00 | 0.00% |
| 2003 | 5.10 | 2.00% |
| 2004 | 6.70 | 31.37% |
| 2005 | 7.00 | 4.48% |
| 2006 | 7.30 | 4.29% |
| 2007 | 7.50 | 2.74% |
| 2008 | 8.50 | 13.33% |
| 2009 | 8.20 | -3.53% |
| 2010 | 8.60 | 4.88% |
| 2011 | 8.20 | -4.65% |
| 2012 | 8.20 | 0.00% |
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