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| year | consumption | change |
| 1986 | 63.00 | NA |
| 1987 | 66.00 | 4.76% |
| 1988 | 68.00 | 3.03% |
| 1989 | 67.00 | -1.47% |
| 1990 | 63.00 | -5.97% |
| 1991 | 63.00 | 0.00% |
| 1992 | 67.00 | 6.35% |
| 1993 | 66.00 | -1.49% |
| 1994 | 66.00 | 0.00% |
| 1995 | 66.00 | 0.00% |
| 1996 | 63.00 | -4.55% |
| 1997 | 59.00 | -6.35% |
| 1998 | 58.00 | -1.69% |
| 1999 | 55.00 | -5.17% |
| 2000 | 52.00 | -5.45% |
| 2001 | 51.00 | -1.92% |
| 2002 | 48.00 | -5.88% |
| 2003 | 49.00 | 2.08% |
| 2004 | 45.00 | -8.16% |
| 2005 | 41.00 | -8.89% |
| 2006 | 34.00 | -17.07% |
| 2007 | 32.00 | -5.88% |
| 2008 | 34.00 | 6.25% |
| 2009 | 33.00 | -2.94% |
| 2010 | 30.00 | -9.09% |
| 2011 | 30.00 | 0.00% |
| 2012 | 28.00 | -6.67% |
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