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| year | consumption | change |
| 1986 | 2.60 | NA |
| 1987 | 2.70 | 3.85% |
| 1988 | 2.60 | -3.70% |
| 1989 | 3.30 | 26.92% |
| 1990 | 2.80 | -15.15% |
| 1991 | 2.50 | -10.71% |
| 1992 | 2.70 | 8.00% |
| 1993 | 2.10 | -22.22% |
| 1994 | 2.30 | 9.52% |
| 1995 | 2.50 | 8.70% |
| 1996 | 4.50 | 80.00% |
| 1997 | 2.90 | -35.56% |
| 1998 | 2.50 | -13.79% |
| 1999 | 3.60 | 44.00% |
| 2000 | 7.00 | 94.44% |
| 2001 | 9.40 | 34.29% |
| 2002 | 11.00 | 17.02% |
| 2003 | 11.00 | 0.00% |
| 2004 | 11.00 | 0.00% |
| 2005 | 11.00 | 0.00% |
| 2006 | 13.00 | 18.18% |
| 2007 | 12.00 | -7.69% |
| 2008 | 12.00 | 0.00% |
| 2009 | 13.00 | 8.33% |
| 2010 | 12.00 | -7.69% |
| 2011 | 12.00 | 0.00% |
| 2012 | 13.00 | 8.33% |
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