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| year | consumption | change |
| 1980 | .10 | NA |
| 1981 | .10 | 0.00% |
| 1982 | .10 | 0.00% |
| 1983 | .10 | 0.00% |
| 1984 | .40 | 300.00% |
| 1985 | .40 | 0.00% |
| 1986 | .50 | 25.00% |
| 1987 | .50 | 0.00% |
| 1988 | .60 | 20.00% |
| 1989 | .60 | 0.00% |
| 1990 | .60 | 0.00% |
| 1991 | .60 | 0.00% |
| 1992 | .70 | 16.67% |
| 1993 | .80 | 14.29% |
| 1994 | 1.70 | 112.50% |
| 1995 | 2.40 | 41.18% |
| 1996 | 2.30 | -4.17% |
| 1997 | 2.00 | -13.04% |
| 1998 | 2.20 | 10.00% |
| 1999 | 2.20 | 0.00% |
| 2000 | 3.10 | 40.91% |
| 2001 | 3.40 | 9.68% |
| 2002 | 6.20 | 82.35% |
| 2003 | 7.00 | 12.90% |
| 2004 | 4.90 | -30.00% |
| 2005 | 3.90 | -20.41% |
| 2006 | 5.40 | 38.46% |
| 2007 | 6.10 | 12.96% |
| 2008 | 6.20 | 1.64% |
| 2009 | 6.90 | 11.29% |
| 2010 | 6.90 | 0.00% |
| 2011 | 6.90 | 0.00% |
| 2012 | 6.90 | 0.00% |
| 2013 | 6.90 | 0.00% |
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