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| year | consumption | change |
| 1986 | 15.00 | NA |
| 1987 | 16.00 | 6.67% |
| 1988 | 11.00 | -31.25% |
| 1989 | 11.00 | 0.00% |
| 1990 | 12.00 | 9.09% |
| 1991 | 17.00 | 41.67% |
| 1992 | 23.00 | 35.29% |
| 1993 | 25.00 | 8.70% |
| 1994 | 26.00 | 4.00% |
| 1995 | 30.00 | 15.38% |
| 1996 | 28.00 | -6.67% |
| 1997 | 31.00 | 10.71% |
| 1998 | 33.00 | 6.45% |
| 1999 | 31.00 | -6.06% |
| 2000 | 32.00 | 3.23% |
| 2001 | 28.00 | -12.50% |
| 2002 | 28.00 | 0.00% |
| 2003 | 29.00 | 3.57% |
| 2004 | 29.00 | 0.00% |
| 2005 | 30.00 | 3.45% |
| 2006 | 27.00 | -10.00% |
| 2007 | 22.00 | -18.52% |
| 2008 | 33.00 | 50.00% |
| 2009 | 38.00 | 15.15% |
| 2010 | 37.00 | -2.63% |
| 2011 | 37.00 | 0.00% |
| 2012 | 39.00 | 5.41% |
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