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| year | consumption | change |
| 1986 | 8.20 | NA |
| 1987 | 9.40 | 14.63% |
| 1988 | 9.50 | 1.06% |
| 1989 | 9.70 | 2.11% |
| 1990 | 10.00 | 3.09% |
| 1991 | 13.00 | 30.00% |
| 1992 | 10.00 | -23.08% |
| 1993 | 12.00 | 20.00% |
| 1994 | 12.00 | 0.00% |
| 1995 | 14.00 | 16.67% |
| 1996 | 15.00 | 7.14% |
| 1997 | 15.00 | 0.00% |
| 1998 | 15.00 | 0.00% |
| 1999 | 15.00 | 0.00% |
| 2000 | 13.00 | -13.33% |
| 2001 | 12.00 | -7.69% |
| 2002 | 11.00 | -8.33% |
| 2003 | 10.00 | -9.09% |
| 2004 | 6.50 | -35.00% |
| 2005 | 8.90 | 36.92% |
| 2006 | 8.60 | -3.37% |
| 2007 | 8.30 | -3.49% |
| 2008 | 7.90 | -4.82% |
| 2009 | 7.80 | -1.27% |
| 2010 | 8.10 | 3.85% |
| 2011 | 8.80 | 8.64% |
| 2012 | 9.20 | 4.55% |
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