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| year | consumption | change |
| 1986 | 76.00 | NA |
| 1987 | 79.00 | 3.95% |
| 1988 | 83.00 | 5.06% |
| 1989 | 76.00 | -8.43% |
| 1990 | 81.00 | 6.58% |
| 1991 | 91.00 | 12.35% |
| 1992 | 84.00 | -7.69% |
| 1993 | 79.00 | -5.95% |
| 1994 | 85.00 | 7.59% |
| 1995 | 80.00 | -5.88% |
| 1996 | 84.00 | 5.00% |
| 1997 | 80.00 | -4.76% |
| 1998 | 82.00 | 2.50% |
| 1999 | 81.00 | -1.22% |
| 2000 | 79.00 | -2.47% |
| 2001 | 74.00 | -6.33% |
| 2002 | 74.00 | 0.00% |
| 2003 | 73.00 | -1.35% |
| 2004 | 74.00 | 1.37% |
| 2005 | 72.00 | -2.70% |
| 2006 | 66.00 | -8.33% |
| 2007 | 65.00 | -1.52% |
| 2008 | 63.00 | -3.08% |
| 2009 | 58.00 | -7.94% |
| 2010 | 59.00 | 1.72% |
| 2011 | 53.00 | -10.17% |
| 2012 | 51.00 | -3.77% |
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