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| year | consumption | change |
| 1980 | 1.20 | NA |
| 1981 | 1.20 | 0.00% |
| 1982 | 1.20 | 0.00% |
| 1983 | 1.30 | 8.33% |
| 1984 | 1.00 | -23.08% |
| 1985 | 1.10 | 10.00% |
| 1986 | 1.40 | 27.27% |
| 1987 | 21.00 | 1,400.00% |
| 1988 | 22.00 | 4.76% |
| 1989 | 20.00 | -9.09% |
| 1990 | 20.00 | 0.00% |
| 1991 | 20.00 | 0.00% |
| 1992 | 21.00 | 5.00% |
| 1993 | 12.00 | -42.86% |
| 1994 | 50.00 | 316.67% |
| 1995 | 57.00 | 14.00% |
| 1996 | 65.00 | 14.04% |
| 1997 | 78.00 | 20.00% |
| 1998 | 75.00 | -3.85% |
| 1999 | 73.00 | -2.67% |
| 2000 | 73.00 | 0.00% |
| 2001 | 60.00 | -17.81% |
| 2002 | 70.00 | 16.67% |
| 2003 | 46.00 | -34.29% |
| 2004 | 10.00 | -78.26% |
| 2005 | 41.00 | 310.00% |
| 2006 | 36.00 | -12.20% |
| 2007 | 33.00 | -8.33% |
| 2008 | 47.00 | 42.42% |
| 2009 | 24.00 | -48.94% |
| 2010 | 32.00 | 33.33% |
| 2011 | 36.00 | 12.50% |
| 2012 | 36.00 | 0.00% |
| 2013 | 110.00 | 205.56% |
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