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| year | consumption | change |
| 1986 | 26.00 | NA |
| 1987 | 36.00 | 38.46% |
| 1988 | 34.00 | -5.56% |
| 1989 | 28.00 | -17.65% |
| 1990 | 36.00 | 28.57% |
| 1991 | 35.00 | -2.78% |
| 1992 | 32.00 | -8.57% |
| 1993 | 36.00 | 12.50% |
| 1994 | 36.00 | 0.00% |
| 1995 | 38.00 | 5.56% |
| 1996 | 37.00 | -2.63% |
| 1997 | 36.00 | -2.70% |
| 1998 | 36.00 | 0.00% |
| 1999 | 32.00 | -11.11% |
| 2000 | 36.00 | 12.50% |
| 2001 | 48.00 | 33.33% |
| 2002 | 48.00 | 0.00% |
| 2003 | 57.00 | 18.75% |
| 2004 | 47.00 | -17.54% |
| 2005 | 48.00 | 2.13% |
| 2006 | 51.00 | 6.25% |
| 2007 | 56.00 | 9.80% |
| 2008 | 48.00 | -14.29% |
| 2009 | 48.00 | 0.00% |
| 2010 | 49.00 | 2.08% |
| 2011 | 47.00 | -4.08% |
| 2012 | 47.00 | 0.00% |
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