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| year | consumption | change |
| 1986 | 92.00 | NA |
| 1987 | 96.00 | 4.35% |
| 1988 | 101.00 | 5.21% |
| 1989 | 111.00 | 9.90% |
| 1990 | 106.00 | -4.50% |
| 1991 | 111.00 | 4.72% |
| 1992 | 120.00 | 8.11% |
| 1993 | 121.00 | 0.83% |
| 1994 | 125.00 | 3.31% |
| 1995 | 114.00 | -8.80% |
| 1996 | 130.00 | 14.04% |
| 1997 | 135.00 | 3.85% |
| 1998 | 133.00 | -1.48% |
| 1999 | 115.00 | -13.53% |
| 2000 | 104.00 | -9.57% |
| 2001 | 93.00 | -10.58% |
| 2002 | 93.00 | 0.00% |
| 2003 | 93.00 | 0.00% |
| 2004 | 103.00 | 10.75% |
| 2005 | 93.00 | -9.71% |
| 2006 | 78.00 | -16.13% |
| 2007 | 75.00 | -3.85% |
| 2008 | 72.00 | -4.00% |
| 2009 | 59.00 | -18.06% |
| 2010 | 63.00 | 6.78% |
| 2011 | 73.00 | 15.87% |
| 2012 | 83.00 | 13.70% |
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