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| year | consumption | change |
| 1980 | 40.00 | NA |
| 1981 | 49.00 | 22.50% |
| 1982 | 46.00 | -6.12% |
| 1983 | 46.00 | 0.00% |
| 1984 | 46.00 | 0.00% |
| 1985 | 47.00 | 2.17% |
| 1986 | 49.00 | 4.26% |
| 1987 | 47.00 | -4.08% |
| 1988 | 44.00 | -6.38% |
| 1989 | 41.00 | -6.82% |
| 1990 | 19.00 | -53.66% |
| 1991 | 18.00 | -5.26% |
| 1992 | 18.00 | 0.00% |
| 1993 | 34.00 | 88.89% |
| 1994 | 35.00 | 2.94% |
| 1995 | 33.00 | -5.71% |
| 1996 | 34.00 | 3.03% |
| 1997 | 8.50 | -75.00% |
| 1998 | 14.00 | 64.71% |
| 1999 | 14.00 | 0.00% |
| 2000 | 12.00 | -14.29% |
| 2001 | 13.00 | 8.33% |
| 2002 | 16.00 | 23.08% |
| 2003 | 18.00 | 12.50% |
| 2004 | 30.00 | 66.67% |
| 2005 | 56.00 | 86.67% |
| 2006 | 63.00 | 12.50% |
| 2007 | 94.00 | 49.21% |
| 2008 | 129.00 | 37.23% |
| 2009 | 123.00 | -4.65% |
| 2010 | 194.00 | 57.72% |
| 2011 | 202.00 | 4.12% |
| 2012 | 233.00 | 15.35% |
| 2013 | 208.00 | -10.73% |
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