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Loading...
| year | consumption | change |
| 1980 | 23.00 | NA |
| 1981 | 20.00 | -13.04% |
| 1982 | 25.00 | 25.00% |
| 1983 | 20.00 | -20.00% |
| 1984 | 24.00 | 20.00% |
| 1985 | 18.00 | -25.00% |
| 1986 | 17.00 | -5.56% |
| 1987 | 5.50 | -67.65% |
| 1988 | 8.80 | 60.00% |
| 1989 | 18.00 | 104.55% |
| 1990 | 26.00 | 44.44% |
| 1991 | 20.00 | -23.08% |
| 1992 | 22.00 | 10.00% |
| 1993 | 22.00 | 0.00% |
| 1994 | 22.00 | 0.00% |
| 1995 | 22.00 | 0.00% |
| 1996 | 24.00 | 9.09% |
| 1997 | 24.00 | 0.00% |
| 1998 | 22.00 | -8.33% |
| 1999 | 20.00 | -9.09% |
| 2000 | 19.00 | -5.00% |
| 2001 | 17.00 | -10.53% |
| 2002 | 18.00 | 5.88% |
| 2003 | 18.00 | 0.00% |
| 2004 | .20 | -98.89% |
| 2005 | .00 | -100.00% |
| 2006 | .00 | NA |
| 2007 | .00 | NA |
| 2008 | .00 | NA |
| 2009 | .00 | NA |
| 2010 | .00 | NA |
| 2011 | .00 | NA |
| 2012 | .00 | NA |
| 2013 | .00 | NA |
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