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| year | consumption | change |
| 1986 | 3.20 | NA |
| 1987 | 3.60 | 12.50% |
| 1988 | 4.10 | 13.89% |
| 1989 | 3.80 | -7.32% |
| 1990 | 4.10 | 7.89% |
| 1991 | 4.20 | 2.44% |
| 1992 | 4.90 | 16.67% |
| 1993 | 5.30 | 8.16% |
| 1994 | 6.80 | 28.30% |
| 1995 | 5.80 | -14.71% |
| 1996 | 6.80 | 17.24% |
| 1997 | 6.50 | -4.41% |
| 1998 | 8.00 | 23.08% |
| 1999 | 8.40 | 5.00% |
| 2000 | 8.20 | -2.38% |
| 2001 | 8.40 | 2.44% |
| 2002 | 7.80 | -7.14% |
| 2003 | 9.70 | 24.36% |
| 2004 | 10.00 | 3.09% |
| 2005 | 10.00 | 0.00% |
| 2006 | 9.60 | -4.00% |
| 2007 | 10.00 | 4.17% |
| 2008 | 9.70 | -3.00% |
| 2009 | 10.00 | 3.09% |
| 2010 | 10.00 | 0.00% |
| 2011 | 10.00 | 0.00% |
| 2012 | 10.00 | 0.00% |
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