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| year | consumption | change |
| 1986 | 19.00 | NA |
| 1987 | 22.00 | 15.79% |
| 1988 | 22.00 | 0.00% |
| 1989 | 18.00 | -18.18% |
| 1990 | 16.00 | -11.11% |
| 1991 | 15.00 | -6.25% |
| 1992 | 6.90 | -54.00% |
| 1993 | 15.00 | 117.39% |
| 1994 | 13.00 | -13.33% |
| 1995 | 14.00 | 7.69% |
| 1996 | 14.00 | 0.00% |
| 1997 | 14.00 | 0.00% |
| 1998 | 14.00 | 0.00% |
| 1999 | 14.00 | 0.00% |
| 2000 | 14.00 | 0.00% |
| 2001 | 15.00 | 7.14% |
| 2002 | 18.00 | 20.00% |
| 2003 | 18.00 | 0.00% |
| 2004 | 6.80 | -62.22% |
| 2005 | 7.50 | 10.29% |
| 2006 | 1.80 | -76.00% |
| 2007 | 1.20 | -33.33% |
| 2008 | 1.00 | -16.67% |
| 2009 | 1.50 | 50.00% |
| 2010 | 1.40 | -6.67% |
| 2011 | 1.40 | 0.00% |
| 2012 | 1.00 | -28.57% |
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