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| year | consumption | change |
| 1980 | 10.00 | NA |
| 1981 | 8.00 | -20.00% |
| 1982 | 8.00 | 0.00% |
| 1983 | 6.00 | -25.00% |
| 1984 | 5.00 | -16.67% |
| 1985 | 5.00 | 0.00% |
| 1986 | 4.50 | -10.00% |
| 1987 | 4.60 | 2.22% |
| 1988 | 4.50 | -2.17% |
| 1989 | 10.00 | 122.22% |
| 1990 | 11.00 | 10.00% |
| 1991 | 11.00 | 0.00% |
| 1992 | 11.00 | 0.00% |
| 1993 | 11.00 | 0.00% |
| 1994 | 11.00 | 0.00% |
| 1995 | 11.00 | 0.00% |
| 1996 | 11.00 | 0.00% |
| 1997 | 11.00 | 0.00% |
| 1998 | 11.00 | 0.00% |
| 1999 | 11.00 | 0.00% |
| 2000 | 11.00 | 0.00% |
| 2001 | 11.00 | 0.00% |
| 2002 | 11.00 | 0.00% |
| 2003 | 12.00 | 9.09% |
| 2004 | 12.00 | 0.00% |
| 2005 | 12.00 | 0.00% |
| 2006 | 11.00 | -8.33% |
| 2007 | 11.00 | 0.00% |
| 2008 | 8.00 | -27.27% |
| 2009 | 8.10 | 1.25% |
| 2010 | 8.10 | 0.00% |
| 2011 | 8.10 | 0.00% |
| 2012 | 8.10 | 0.00% |
| 2013 | 8.00 | -1.23% |
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