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| year | consumption | change |
| 1986 | 40.00 | NA |
| 1987 | 41.00 | 2.50% |
| 1988 | 40.00 | -2.44% |
| 1989 | 33.00 | -17.50% |
| 1990 | 31.00 | -6.06% |
| 1991 | 17.00 | -45.16% |
| 1992 | 20.00 | 17.65% |
| 1993 | 21.00 | 5.00% |
| 1994 | 23.00 | 9.52% |
| 1995 | 27.00 | 17.39% |
| 1996 | 23.00 | -14.81% |
| 1997 | 20.00 | -13.04% |
| 1998 | 19.00 | -5.00% |
| 1999 | 18.00 | -5.26% |
| 2000 | 15.00 | -16.67% |
| 2001 | 14.00 | -6.67% |
| 2002 | 21.00 | 50.00% |
| 2003 | 14.00 | -33.33% |
| 2004 | 13.00 | -7.14% |
| 2005 | 15.00 | 15.38% |
| 2006 | 14.00 | -6.67% |
| 2007 | 14.00 | 0.00% |
| 2008 | 14.00 | 0.00% |
| 2009 | 15.00 | 7.14% |
| 2010 | 14.00 | -6.67% |
| 2011 | 13.00 | -7.14% |
| 2012 | 12.00 | -7.69% |
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