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| year | consumption | change |
| 1986 | 13.00 | NA |
| 1987 | 15.00 | 15.38% |
| 1988 | 14.00 | -6.67% |
| 1989 | 15.00 | 7.14% |
| 1990 | 5.00 | -66.67% |
| 1991 | 4.80 | -4.00% |
| 1992 | 4.90 | 2.08% |
| 1993 | 5.00 | 2.04% |
| 1994 | 5.10 | 2.00% |
| 1995 | 5.60 | 9.80% |
| 1996 | 5.90 | 5.36% |
| 1997 | 7.90 | 33.90% |
| 1998 | 8.00 | 1.27% |
| 1999 | 6.90 | -13.75% |
| 2000 | 8.60 | 24.64% |
| 2001 | 7.50 | -12.79% |
| 2002 | 7.70 | 2.67% |
| 2003 | 8.50 | 10.39% |
| 2004 | 8.80 | 3.53% |
| 2005 | 6.20 | -29.55% |
| 2006 | 9.40 | 51.61% |
| 2007 | 6.80 | -27.66% |
| 2008 | 7.20 | 5.88% |
| 2009 | 7.70 | 6.94% |
| 2010 | 7.60 | -1.30% |
| 2011 | 7.40 | -2.63% |
| 2012 | 6.70 | -9.46% |
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