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| year | consumption | change |
| 1986 | 93.00 | NA |
| 1987 | 86.00 | -7.53% |
| 1988 | 65.00 | -24.42% |
| 1989 | 56.00 | -13.85% |
| 1990 | 50.00 | -10.71% |
| 1991 | 52.00 | 4.00% |
| 1992 | 53.00 | 1.92% |
| 1993 | 58.00 | 9.43% |
| 1994 | 68.00 | 17.24% |
| 1995 | 65.00 | -4.41% |
| 1996 | 81.00 | 24.62% |
| 1997 | 68.00 | -16.05% |
| 1998 | 74.00 | 8.82% |
| 1999 | 67.00 | -9.46% |
| 2000 | 55.00 | -17.91% |
| 2001 | 57.00 | 3.64% |
| 2002 | 56.00 | -1.75% |
| 2003 | 63.00 | 12.50% |
| 2004 | 62.00 | -1.59% |
| 2005 | 58.00 | -6.45% |
| 2006 | 61.00 | 5.17% |
| 2007 | 55.00 | -9.84% |
| 2008 | 52.00 | -5.45% |
| 2009 | 55.00 | 5.77% |
| 2010 | 55.00 | 0.00% |
| 2011 | 43.00 | -21.82% |
| 2012 | 40.00 | -6.98% |
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