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| year | consumption | change |
| 1986 | 2.40 | NA |
| 1987 | 2.80 | 16.67% |
| 1988 | 3.20 | 14.29% |
| 1989 | 3.50 | 9.38% |
| 1990 | 3.60 | 2.86% |
| 1991 | 3.50 | -2.78% |
| 1992 | 3.50 | 0.00% |
| 1993 | 3.50 | 0.00% |
| 1994 | 3.60 | 2.86% |
| 1995 | 3.90 | 8.33% |
| 1996 | 3.90 | 0.00% |
| 1997 | 3.90 | 0.00% |
| 1998 | 3.90 | 0.00% |
| 1999 | 3.90 | 0.00% |
| 2000 | 4.00 | 2.56% |
| 2001 | 4.00 | 0.00% |
| 2002 | 4.00 | 0.00% |
| 2003 | 4.00 | 0.00% |
| 2004 | 4.10 | 2.50% |
| 2005 | 4.10 | 0.00% |
| 2006 | 3.50 | -14.63% |
| 2007 | 4.20 | 20.00% |
| 2008 | 4.20 | 0.00% |
| 2009 | 4.20 | 0.00% |
| 2010 | 2.80 | -33.33% |
| 2011 | 4.20 | 50.00% |
| 2012 | 4.20 | 0.00% |
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