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| year | consumption | change |
| 1980 | 2.50 | NA |
| 1981 | 3.20 | 28.00% |
| 1982 | 3.00 | -6.25% |
| 1983 | 3.20 | 6.67% |
| 1984 | 2.00 | -37.50% |
| 1985 | 3.00 | 50.00% |
| 1986 | 3.00 | 0.00% |
| 1987 | 2.10 | -30.00% |
| 1988 | 2.10 | 0.00% |
| 1989 | 2.10 | 0.00% |
| 1990 | 2.00 | -4.76% |
| 1991 | 1.40 | -30.00% |
| 1992 | .80 | -42.86% |
| 1993 | 1.10 | 37.50% |
| 1994 | 1.10 | 0.00% |
| 1995 | .70 | -36.36% |
| 1996 | .70 | 0.00% |
| 1997 | 1.80 | 157.14% |
| 1998 | 1.80 | 0.00% |
| 1999 | 1.80 | 0.00% |
| 2000 | 1.80 | 0.00% |
| 2001 | 1.80 | 0.00% |
| 2002 | 1.80 | 0.00% |
| 2003 | 1.80 | 0.00% |
| 2004 | 1.80 | 0.00% |
| 2005 | 16.00 | 788.89% |
| 2006 | 20.00 | 25.00% |
| 2007 | 22.00 | 10.00% |
| 2008 | 20.00 | -9.09% |
| 2009 | 23.00 | 15.00% |
| 2010 | 24.00 | 4.35% |
| 2011 | 30.00 | 25.00% |
| 2012 | 44.00 | 46.67% |
| 2013 | 42.00 | -4.55% |
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