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| year | consumption | change |
| 1980 | 2.30 | NA |
| 1981 | 2.40 | 4.35% |
| 1982 | 2.60 | 8.33% |
| 1983 | 3.10 | 19.23% |
| 1984 | 3.20 | 3.23% |
| 1985 | 3.40 | 6.25% |
| 1986 | 3.40 | 0.00% |
| 1987 | 3.80 | 11.76% |
| 1988 | 4.00 | 5.26% |
| 1989 | 4.20 | 5.00% |
| 1990 | 4.60 | 9.52% |
| 1991 | 4.80 | 4.35% |
| 1992 | 5.20 | 8.33% |
| 1993 | 5.20 | 0.00% |
| 1994 | 5.60 | 7.69% |
| 1995 | 6.20 | 10.71% |
| 1996 | 6.80 | 9.68% |
| 1997 | 7.30 | 7.35% |
| 1998 | 7.60 | 4.11% |
| 1999 | 8.30 | 9.21% |
| 2000 | 8.80 | 6.02% |
| 2001 | 9.50 | 7.95% |
| 2002 | 9.80 | 3.16% |
| 2003 | 10.00 | 2.04% |
| 2004 | 11.00 | 10.00% |
| 2005 | 11.00 | 0.00% |
| 2006 | 12.00 | 9.09% |
| 2007 | 11.00 | -8.33% |
| 2008 | 12.00 | 9.09% |
| 2009 | 13.00 | 8.33% |
| 2010 | 13.00 | 0.00% |
| 2011 | 13.00 | 0.00% |
| 2012 | 13.00 | 0.00% |
| 2013 | 13.00 | 0.00% |
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