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| year | consumption | change |
| 1986 | 64.00 | NA |
| 1987 | 67.00 | 4.69% |
| 1988 | 62.00 | -7.46% |
| 1989 | 64.00 | 3.23% |
| 1990 | 52.00 | -18.75% |
| 1991 | 43.00 | -17.31% |
| 1992 | 44.00 | 2.33% |
| 1993 | 46.00 | 4.55% |
| 1994 | 48.00 | 4.35% |
| 1995 | 45.00 | -6.25% |
| 1996 | 44.00 | -2.22% |
| 1997 | 43.00 | -2.27% |
| 1998 | 47.00 | 9.30% |
| 1999 | 44.00 | -6.38% |
| 2000 | 41.00 | -6.82% |
| 2001 | 41.00 | 0.00% |
| 2002 | 39.00 | -4.88% |
| 2003 | 40.00 | 2.56% |
| 2004 | 39.00 | -2.50% |
| 2005 | 37.00 | -5.13% |
| 2006 | 33.00 | -10.81% |
| 2007 | 32.00 | -3.03% |
| 2008 | 31.00 | -3.13% |
| 2009 | 30.00 | -3.23% |
| 2010 | 30.00 | 0.00% |
| 2011 | 26.00 | -13.33% |
| 2012 | 21.00 | -19.23% |
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