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| year | consumption | change |
| 1980 | 6.00 | NA |
| 1981 | 4.00 | -33.33% |
| 1982 | 5.00 | 25.00% |
| 1983 | 4.00 | -20.00% |
| 1984 | 4.00 | 0.00% |
| 1985 | 4.80 | 20.00% |
| 1986 | 5.10 | 6.25% |
| 1987 | 8.30 | 62.75% |
| 1988 | 9.00 | 8.43% |
| 1989 | 8.50 | -5.56% |
| 1990 | 4.70 | -44.71% |
| 1991 | 4.70 | 0.00% |
| 1992 | 5.40 | 14.89% |
| 1993 | 4.30 | -20.37% |
| 1994 | 3.70 | -13.95% |
| 1995 | 6.30 | 70.27% |
| 1996 | 7.50 | 19.05% |
| 1997 | 9.40 | 25.33% |
| 1998 | 8.90 | -5.32% |
| 1999 | 10.00 | 12.36% |
| 2000 | 10.00 | 0.00% |
| 2001 | 11.00 | 10.00% |
| 2002 | 12.00 | 9.09% |
| 2003 | 12.00 | 0.00% |
| 2004 | 12.00 | 0.00% |
| 2005 | 12.00 | 0.00% |
| 2006 | 12.00 | 0.00% |
| 2007 | 13.00 | 8.33% |
| 2008 | 17.00 | 30.77% |
| 2009 | 15.00 | -11.76% |
| 2010 | 14.00 | -6.67% |
| 2011 | 15.00 | 7.14% |
| 2012 | 15.00 | 0.00% |
| 2013 | 15.00 | 0.00% |
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