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| year | consumption | change |
| 1986 | 14.00 | NA |
| 1987 | 26.00 | 85.71% |
| 1988 | 23.00 | -11.54% |
| 1989 | 21.00 | -8.70% |
| 1990 | 24.00 | 14.29% |
| 1991 | 22.00 | -8.33% |
| 1992 | 26.00 | 18.18% |
| 1993 | 25.00 | -3.85% |
| 1994 | 29.00 | 16.00% |
| 1995 | 31.00 | 6.90% |
| 1996 | 34.00 | 9.68% |
| 1997 | 31.00 | -8.82% |
| 1998 | 37.00 | 19.35% |
| 1999 | 37.00 | 0.00% |
| 2000 | 39.00 | 5.41% |
| 2001 | 38.00 | -2.56% |
| 2002 | 39.00 | 2.63% |
| 2003 | 36.00 | -7.69% |
| 2004 | 29.00 | -19.44% |
| 2005 | 26.00 | -10.34% |
| 2006 | 26.00 | 0.00% |
| 2007 | 22.00 | -15.38% |
| 2008 | 20.00 | -9.09% |
| 2009 | 16.00 | -20.00% |
| 2010 | 26.00 | 62.50% |
| 2011 | 31.00 | 19.23% |
| 2012 | 33.00 | 6.45% |
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