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| year | consumption | change |
| 1980 | 3.30 | NA |
| 1981 | 3.70 | 12.12% |
| 1982 | 3.70 | 0.00% |
| 1983 | 4.40 | 18.92% |
| 1984 | 5.80 | 31.82% |
| 1985 | 7.90 | 36.21% |
| 1986 | 9.80 | 24.05% |
| 1987 | 13.00 | 32.65% |
| 1988 | 13.00 | 0.00% |
| 1989 | 14.00 | 7.69% |
| 1990 | 13.00 | -7.14% |
| 1991 | 13.00 | 0.00% |
| 1992 | 13.00 | 0.00% |
| 1993 | 13.00 | 0.00% |
| 1994 | 14.00 | 7.69% |
| 1995 | 14.00 | 0.00% |
| 1996 | 14.00 | 0.00% |
| 1997 | 14.00 | 0.00% |
| 1998 | 10.00 | -28.57% |
| 1999 | 11.00 | 10.00% |
| 2000 | 11.00 | 0.00% |
| 2001 | 11.00 | 0.00% |
| 2002 | 12.00 | 9.09% |
| 2003 | 12.00 | 0.00% |
| 2004 | 13.00 | 8.33% |
| 2005 | 19.00 | 46.15% |
| 2006 | 21.00 | 10.53% |
| 2007 | 21.00 | 0.00% |
| 2008 | 25.00 | 19.05% |
| 2009 | 23.00 | -8.00% |
| 2010 | 25.00 | 8.70% |
| 2011 | 21.00 | -16.00% |
| 2012 | 26.00 | 23.81% |
| 2013 | 23.00 | -11.54% |
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