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| year | consumption | change |
| 1986 | 2.10 | NA |
| 1987 | 3.20 | 52.38% |
| 1988 | 2.40 | -25.00% |
| 1989 | 2.80 | 16.67% |
| 1990 | 2.60 | -7.14% |
| 1991 | 2.10 | -19.23% |
| 1992 | 2.50 | 19.05% |
| 1993 | 2.50 | 0.00% |
| 1994 | 2.60 | 4.00% |
| 1995 | 2.60 | 0.00% |
| 1996 | 2.60 | 0.00% |
| 1997 | 2.60 | 0.00% |
| 1998 | 2.70 | 3.85% |
| 1999 | 2.80 | 3.70% |
| 2000 | 2.80 | 0.00% |
| 2001 | 3.30 | 17.86% |
| 2002 | 3.80 | 15.15% |
| 2003 | 4.10 | 7.89% |
| 2004 | 4.40 | 7.32% |
| 2005 | 4.70 | 6.82% |
| 2006 | 5.00 | 6.38% |
| 2007 | 5.40 | 8.00% |
| 2008 | 5.80 | 7.41% |
| 2009 | 6.10 | 5.17% |
| 2010 | 7.10 | 16.39% |
| 2011 | 6.80 | -4.23% |
| 2012 | 7.40 | 8.82% |
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