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| year | consumption | change |
| 1986 | 25.00 | NA |
| 1987 | 25.00 | 0.00% |
| 1988 | 23.00 | -8.00% |
| 1989 | 23.00 | 0.00% |
| 1990 | 26.00 | 13.04% |
| 1991 | 27.00 | 3.85% |
| 1992 | 27.00 | 0.00% |
| 1993 | 27.00 | 0.00% |
| 1994 | 22.00 | -18.52% |
| 1995 | 19.00 | -13.64% |
| 1996 | 14.00 | -26.32% |
| 1997 | 12.00 | -14.29% |
| 1998 | 7.90 | -34.17% |
| 1999 | 21.00 | 165.82% |
| 2000 | 26.00 | 23.81% |
| 2001 | 5.80 | -77.69% |
| 2002 | 5.80 | 0.00% |
| 2003 | 5.80 | 0.00% |
| 2004 | 5.70 | -1.72% |
| 2005 | 4.80 | -15.79% |
| 2006 | 3.70 | -22.92% |
| 2007 | 4.40 | 18.92% |
| 2008 | 4.50 | 2.27% |
| 2009 | 3.40 | -24.44% |
| 2010 | 4.70 | 38.24% |
| 2011 | 4.80 | 2.13% |
| 2012 | 4.80 | 0.00% |
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