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| year | consumption | change |
| 1980 | 72.00 | NA |
| 1981 | 53.00 | -26.39% |
| 1982 | 67.00 | 26.42% |
| 1983 | 49.00 | -26.87% |
| 1984 | 45.00 | -8.16% |
| 1985 | 36.00 | -20.00% |
| 1986 | 31.00 | -13.89% |
| 1987 | 31.00 | 0.00% |
| 1988 | 18.00 | -41.94% |
| 1989 | 12.00 | -33.33% |
| 1990 | 20.00 | 66.67% |
| 1991 | 12.00 | -40.00% |
| 1992 | 13.00 | 8.33% |
| 1993 | 17.00 | 30.77% |
| 1994 | 19.00 | 11.76% |
| 1995 | 19.00 | 0.00% |
| 1996 | 19.00 | 0.00% |
| 1997 | 19.00 | 0.00% |
| 1998 | 14.00 | -26.32% |
| 1999 | 61.00 | 335.71% |
| 2000 | 69.00 | 13.11% |
| 2001 | 52.00 | -24.64% |
| 2002 | 75.00 | 44.23% |
| 2003 | 71.00 | -5.33% |
| 2004 | 67.00 | -5.63% |
| 2005 | 65.00 | -2.99% |
| 2006 | 65.00 | 0.00% |
| 2007 | 67.00 | 3.08% |
| 2008 | 57.00 | -14.93% |
| 2009 | 53.00 | -7.02% |
| 2010 | 60.00 | 13.21% |
| 2011 | 60.00 | 0.00% |
| 2012 | 60.00 | 0.00% |
| 2013 | 60.00 | 0.00% |
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