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| year | consumption | change |
| 1980 | 9.20 | NA |
| 1981 | 8.80 | -4.35% |
| 1982 | 10.00 | 13.64% |
| 1983 | 12.00 | 20.00% |
| 1984 | 12.00 | 0.00% |
| 1985 | 13.00 | 8.33% |
| 1986 | 14.00 | 7.69% |
| 1987 | 16.00 | 14.29% |
| 1988 | 18.00 | 12.50% |
| 1989 | 15.00 | -16.67% |
| 1990 | 19.00 | 26.67% |
| 1991 | 20.00 | 5.26% |
| 1992 | 20.00 | 0.00% |
| 1993 | 20.00 | 0.00% |
| 1994 | 18.00 | -10.00% |
| 1995 | 20.00 | 11.11% |
| 1996 | 20.00 | 0.00% |
| 1997 | 20.00 | 0.00% |
| 1998 | 20.00 | 0.00% |
| 1999 | 20.00 | 0.00% |
| 2000 | 20.00 | 0.00% |
| 2001 | 19.00 | -5.00% |
| 2002 | 22.00 | 15.79% |
| 2003 | 23.00 | 4.55% |
| 2004 | 26.00 | 13.04% |
| 2005 | 23.00 | -11.54% |
| 2006 | 24.00 | 4.35% |
| 2007 | 29.00 | 20.83% |
| 2008 | 24.00 | -17.24% |
| 2009 | 24.00 | 0.00% |
| 2010 | 26.00 | 8.33% |
| 2011 | 27.00 | 3.85% |
| 2012 | 27.00 | 0.00% |
| 2013 | 17.00 | -37.04% |
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