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| year | consumption | change |
| 1986 | 21.00 | NA |
| 1987 | 23.00 | 9.52% |
| 1988 | 23.00 | 0.00% |
| 1989 | 24.00 | 4.35% |
| 1990 | 27.00 | 12.50% |
| 1991 | 29.00 | 7.41% |
| 1992 | 32.00 | 10.34% |
| 1993 | 32.00 | 0.00% |
| 1994 | 37.00 | 15.63% |
| 1995 | 44.00 | 18.92% |
| 1996 | 41.00 | -6.82% |
| 1997 | 48.00 | 17.07% |
| 1998 | 44.00 | -8.33% |
| 1999 | 49.00 | 11.36% |
| 2000 | 60.00 | 22.45% |
| 2001 | 55.00 | -8.33% |
| 2002 | 62.00 | 12.73% |
| 2003 | 65.00 | 4.84% |
| 2004 | 61.00 | -6.15% |
| 2005 | 54.00 | -11.48% |
| 2006 | 62.00 | 14.81% |
| 2007 | 70.00 | 12.90% |
| 2008 | 72.00 | 2.86% |
| 2009 | 63.00 | -12.50% |
| 2010 | 62.00 | -1.59% |
| 2011 | 62.00 | 0.00% |
| 2012 | 97.00 | 56.45% |
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