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| year | consumption | change |
| 1986 | 68.00 | NA |
| 1987 | 70.00 | 2.94% |
| 1988 | 67.00 | -4.29% |
| 1989 | 67.00 | 0.00% |
| 1990 | 66.00 | -1.49% |
| 1991 | 63.00 | -4.55% |
| 1992 | 63.00 | 0.00% |
| 1993 | 67.00 | 6.35% |
| 1994 | 69.00 | 2.99% |
| 1995 | 72.00 | 4.35% |
| 1996 | 81.00 | 12.50% |
| 1997 | 81.00 | 0.00% |
| 1998 | 84.00 | 3.70% |
| 1999 | 88.00 | 4.76% |
| 2000 | 79.00 | -10.23% |
| 2001 | 82.00 | 3.80% |
| 2002 | 84.00 | 2.44% |
| 2003 | 84.00 | 0.00% |
| 2004 | 82.00 | -2.38% |
| 2005 | 84.00 | 2.44% |
| 2006 | 87.00 | 3.57% |
| 2007 | 92.00 | 5.75% |
| 2008 | 89.00 | -3.26% |
| 2009 | 93.00 | 4.49% |
| 2010 | 100.00 | 7.53% |
| 2011 | 97.00 | -3.00% |
| 2012 | 94.00 | -3.09% |
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