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| year | consumption | change |
| 1986 | 3.10 | NA |
| 1987 | 3.50 | 12.90% |
| 1988 | 3.60 | 2.86% |
| 1989 | 3.70 | 2.78% |
| 1990 | 3.90 | 5.41% |
| 1991 | 4.10 | 5.13% |
| 1992 | 5.00 | 21.95% |
| 1993 | 4.80 | -4.00% |
| 1994 | 6.10 | 27.08% |
| 1995 | 7.00 | 14.75% |
| 1996 | 7.00 | 0.00% |
| 1997 | 7.10 | 1.43% |
| 1998 | 8.00 | 12.68% |
| 1999 | 8.20 | 2.50% |
| 2000 | 9.10 | 10.98% |
| 2001 | 8.80 | -3.30% |
| 2002 | 9.40 | 6.82% |
| 2003 | 9.50 | 1.06% |
| 2004 | 9.30 | -2.11% |
| 2005 | 9.50 | 2.15% |
| 2006 | 10.00 | 5.26% |
| 2007 | 11.00 | 10.00% |
| 2008 | 11.00 | 0.00% |
| 2009 | 11.00 | 0.00% |
| 2010 | 9.90 | -10.00% |
| 2011 | 12.00 | 21.21% |
| 2012 | 12.00 | 0.00% |
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