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| year | consumption | change |
| 1986 | 84.00 | NA |
| 1987 | 84.00 | 0.00% |
| 1988 | 84.00 | 0.00% |
| 1989 | 74.00 | -11.90% |
| 1990 | 82.00 | 10.81% |
| 1991 | 64.00 | -21.95% |
| 1992 | 68.00 | 6.25% |
| 1993 | 58.00 | -14.71% |
| 1994 | 53.00 | -8.62% |
| 1995 | 58.00 | 9.43% |
| 1996 | 71.00 | 22.41% |
| 1997 | 62.00 | -12.68% |
| 1998 | 57.00 | -8.06% |
| 1999 | 50.00 | -12.28% |
| 2000 | 59.00 | 18.00% |
| 2001 | 65.00 | 10.17% |
| 2002 | 57.00 | -12.31% |
| 2003 | 68.00 | 19.30% |
| 2004 | 63.00 | -7.35% |
| 2005 | 60.00 | -4.76% |
| 2006 | 62.00 | 3.33% |
| 2007 | 79.00 | 27.42% |
| 2008 | 93.00 | 17.72% |
| 2009 | 84.00 | -9.68% |
| 2010 | 84.00 | 0.00% |
| 2011 | 92.00 | 9.52% |
| 2012 | 94.00 | 2.17% |
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