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| year | consumption | change |
| 1986 | 72.00 | NA |
| 1987 | 75.00 | 4.17% |
| 1988 | 68.00 | -9.33% |
| 1989 | 67.00 | -1.47% |
| 1990 | 66.00 | -1.49% |
| 1991 | 57.00 | -13.64% |
| 1992 | 58.00 | 1.75% |
| 1993 | 47.00 | -18.97% |
| 1994 | 47.00 | 0.00% |
| 1995 | 37.00 | -21.28% |
| 1996 | 35.00 | -5.41% |
| 1997 | 36.00 | 2.86% |
| 1998 | 38.00 | 5.56% |
| 1999 | 39.00 | 2.63% |
| 2000 | 41.00 | 5.13% |
| 2001 | 42.00 | 2.44% |
| 2002 | 47.00 | 11.90% |
| 2003 | 46.00 | -2.13% |
| 2004 | 49.00 | 6.52% |
| 2005 | 57.00 | 16.33% |
| 2006 | 60.00 | 5.26% |
| 2007 | 63.00 | 5.00% |
| 2008 | 63.00 | 0.00% |
| 2009 | 63.00 | 0.00% |
| 2010 | 62.00 | -1.59% |
| 2011 | 59.00 | -4.84% |
| 2012 | 53.00 | -10.17% |
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