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| year | consumption | change |
| 1986 | 5.00 | NA |
| 1987 | 4.90 | -2.00% |
| 1988 | 5.00 | 2.04% |
| 1989 | 5.50 | 10.00% |
| 1990 | 4.70 | -14.55% |
| 1991 | 6.90 | 46.81% |
| 1992 | 7.40 | 7.25% |
| 1993 | 7.80 | 5.41% |
| 1994 | 7.80 | 0.00% |
| 1995 | 7.90 | 1.28% |
| 1996 | 7.80 | -1.27% |
| 1997 | 8.40 | 7.69% |
| 1998 | 7.40 | -11.90% |
| 1999 | 7.50 | 1.35% |
| 2000 | 13.00 | 73.33% |
| 2001 | 13.00 | 0.00% |
| 2002 | 14.00 | 7.69% |
| 2003 | 13.00 | -7.14% |
| 2004 | 14.00 | 7.69% |
| 2005 | 15.00 | 7.14% |
| 2006 | 13.00 | -13.33% |
| 2007 | 14.00 | 7.69% |
| 2008 | 12.00 | -14.29% |
| 2009 | 15.00 | 25.00% |
| 2010 | 17.00 | 13.33% |
| 2011 | 20.00 | 17.65% |
| 2012 | 24.00 | 20.00% |
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