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| year | consumption | change |
| 1980 | .90 | NA |
| 1981 | .90 | 0.00% |
| 1982 | .90 | 0.00% |
| 1983 | .90 | 0.00% |
| 1984 | .90 | 0.00% |
| 1985 | 1.00 | 11.11% |
| 1986 | 1.10 | 10.00% |
| 1987 | 1.10 | 0.00% |
| 1988 | 1.00 | -9.09% |
| 1989 | 1.00 | 0.00% |
| 1990 | 1.00 | 0.00% |
| 1991 | 1.00 | 0.00% |
| 1992 | .80 | -20.00% |
| 1993 | .70 | -12.50% |
| 1994 | .80 | 14.29% |
| 1995 | .70 | -12.50% |
| 1996 | .60 | -14.29% |
| 1997 | .60 | 0.00% |
| 1998 | .50 | -16.67% |
| 1999 | .50 | 0.00% |
| 2000 | .50 | 0.00% |
| 2001 | .70 | 40.00% |
| 2002 | .70 | 0.00% |
| 2003 | 1.00 | 42.86% |
| 2004 | .90 | -10.00% |
| 2005 | 1.00 | 11.11% |
| 2006 | 1.20 | 20.00% |
| 2007 | 1.50 | 25.00% |
| 2008 | 1.40 | -6.67% |
| 2009 | 2.00 | 42.86% |
| 2010 | 2.40 | 20.00% |
| 2011 | 3.00 | 25.00% |
| 2012 | 3.90 | 30.00% |
| 2013 | 4.60 | 17.95% |
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