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| year | consumption | change |
| 1980 | 9.50 | NA |
| 1981 | 10.00 | 5.26% |
| 1982 | 10.00 | 0.00% |
| 1983 | 10.00 | 0.00% |
| 1984 | 11.00 | 10.00% |
| 1985 | 11.00 | 0.00% |
| 1986 | 12.00 | 9.09% |
| 1987 | 12.00 | 0.00% |
| 1988 | 13.00 | 8.33% |
| 1989 | 13.00 | 0.00% |
| 1990 | 12.00 | -7.69% |
| 1991 | 10.00 | -16.67% |
| 1992 | 10.00 | 0.00% |
| 1993 | 9.30 | -7.00% |
| 1994 | 9.20 | -1.08% |
| 1995 | 9.40 | 2.17% |
| 1996 | 10.00 | 6.38% |
| 1997 | 11.00 | 10.00% |
| 1998 | 11.00 | 0.00% |
| 1999 | 11.00 | 0.00% |
| 2000 | 12.00 | 9.09% |
| 2001 | 12.00 | 0.00% |
| 2002 | 12.00 | 0.00% |
| 2003 | 13.00 | 8.33% |
| 2004 | 12.00 | -7.69% |
| 2005 | 12.00 | 0.00% |
| 2006 | 13.00 | 8.33% |
| 2007 | 14.00 | 7.69% |
| 2008 | 14.00 | 0.00% |
| 2009 | 14.00 | 0.00% |
| 2010 | 14.00 | 0.00% |
| 2011 | 14.00 | 0.00% |
| 2012 | 14.00 | 0.00% |
| 2013 | 15.00 | 7.14% |
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