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| year | consumption | change |
| 1986 | 31.00 | NA |
| 1987 | 23.00 | -25.81% |
| 1988 | 13.00 | -43.48% |
| 1989 | 12.00 | -7.69% |
| 1990 | 17.00 | 41.67% |
| 1991 | 21.00 | 23.53% |
| 1992 | 22.00 | 4.76% |
| 1993 | 22.00 | 0.00% |
| 1994 | 25.00 | 13.64% |
| 1995 | 24.00 | -4.00% |
| 1996 | 23.00 | -4.17% |
| 1997 | 27.00 | 17.39% |
| 1998 | 32.00 | 18.52% |
| 1999 | 38.00 | 18.75% |
| 2000 | 32.00 | -15.79% |
| 2001 | 33.00 | 3.13% |
| 2002 | 27.00 | -18.18% |
| 2003 | 21.00 | -22.22% |
| 2004 | 24.00 | 14.29% |
| 2005 | 23.00 | -4.17% |
| 2006 | 23.00 | 0.00% |
| 2007 | 15.00 | -34.78% |
| 2008 | 13.00 | -13.33% |
| 2009 | 9.30 | -28.46% |
| 2010 | 7.10 | -23.66% |
| 2011 | 5.50 | -22.54% |
| 2012 | 4.00 | -27.27% |
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