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| year | consumption | change |
| 1986 | 55.00 | NA |
| 1987 | 52.00 | -5.45% |
| 1988 | 47.00 | -9.62% |
| 1989 | 43.00 | -8.51% |
| 1990 | 42.00 | -2.33% |
| 1991 | 40.00 | -4.76% |
| 1992 | 42.00 | 5.00% |
| 1993 | 36.00 | -14.29% |
| 1994 | 36.00 | 0.00% |
| 1995 | 34.00 | -5.56% |
| 1996 | 34.00 | 0.00% |
| 1997 | 32.00 | -5.88% |
| 1998 | 36.00 | 12.50% |
| 1999 | 36.00 | 0.00% |
| 2000 | 35.00 | -2.78% |
| 2001 | 36.00 | 2.86% |
| 2002 | 38.00 | 5.56% |
| 2003 | 39.00 | 2.63% |
| 2004 | 37.00 | -5.13% |
| 2005 | 34.00 | -8.11% |
| 2006 | 36.00 | 5.88% |
| 2007 | 32.00 | -11.11% |
| 2008 | 28.00 | -12.50% |
| 2009 | 22.00 | -21.43% |
| 2010 | 24.00 | 9.09% |
| 2011 | 21.00 | -12.50% |
| 2012 | 17.00 | -19.05% |
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