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| year | consumption | change |
| 1986 | 60.20 | NA |
| 1987 | 63.80 | 5.98% |
| 1988 | 62.20 | -2.51% |
| 1989 | 57.70 | -7.23% |
| 1990 | 92.30 | 59.97% |
| 1991 | 91.60 | -0.76% |
| 1992 | 83.10 | -9.28% |
| 1993 | 91.20 | 9.75% |
| 1994 | 91.20 | 0.00% |
| 1995 | 94.30 | 3.40% |
| 1996 | 92.10 | -2.33% |
| 1997 | 98.90 | 7.38% |
| 1998 | 99.70 | 0.81% |
| 1999 | 95.30 | -4.41% |
| 2000 | 28.70 | -69.88% |
| 2001 | 32.00 | 11.50% |
| 2002 | 31.80 | -0.63% |
| 2003 | 29.20 | -8.18% |
| 2004 | 15.70 | -46.23% |
| 2005 | 16.10 | 2.55% |
| 2006 | 8.80 | -45.34% |
| 2007 | 8.40 | -4.55% |
| 2008 | 8.20 | -2.38% |
| 2009 | 9.70 | 18.29% |
| 2010 | 16.50 | 70.10% |
| 2011 | 17.40 | 5.45% |
| 2012 | 10.80 | -37.93% |
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