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| year | consumption | change |
| 1986 | 22.00 | NA |
| 1987 | 20.00 | -9.09% |
| 1988 | 20.00 | 0.00% |
| 1989 | 20.00 | 0.00% |
| 1990 | 20.00 | 0.00% |
| 1991 | 21.00 | 5.00% |
| 1992 | 24.00 | 14.29% |
| 1993 | 25.00 | 4.17% |
| 1994 | 25.00 | 0.00% |
| 1995 | 25.00 | 0.00% |
| 1996 | 27.00 | 8.00% |
| 1997 | 30.00 | 11.11% |
| 1998 | 31.00 | 3.33% |
| 1999 | 32.00 | 3.23% |
| 2000 | 33.00 | 3.13% |
| 2001 | 35.00 | 6.06% |
| 2002 | 35.00 | 0.00% |
| 2003 | 36.00 | 2.86% |
| 2004 | 37.00 | 2.78% |
| 2005 | 32.00 | -13.51% |
| 2006 | 37.00 | 15.63% |
| 2007 | 37.00 | 0.00% |
| 2008 | 36.00 | -2.70% |
| 2009 | 37.00 | 2.78% |
| 2010 | 35.00 | -5.41% |
| 2011 | 33.00 | -5.71% |
| 2012 | 34.00 | 3.03% |
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