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| year | consumption | change |
| 1980 | .80 | NA |
| 1981 | .60 | -25.00% |
| 1982 | .80 | 33.33% |
| 1983 | .70 | -12.50% |
| 1984 | .70 | 0.00% |
| 1985 | .90 | 28.57% |
| 1986 | .90 | 0.00% |
| 1987 | 1.00 | 11.11% |
| 1988 | 1.20 | 20.00% |
| 1989 | 1.20 | 0.00% |
| 1990 | 1.20 | 0.00% |
| 1991 | 1.20 | 0.00% |
| 1992 | 1.20 | 0.00% |
| 1993 | 1.20 | 0.00% |
| 1994 | 1.40 | 16.67% |
| 1995 | 1.40 | 0.00% |
| 1996 | 1.40 | 0.00% |
| 1997 | 1.50 | 7.14% |
| 1998 | 1.50 | 0.00% |
| 1999 | 1.50 | 0.00% |
| 2000 | 2.30 | 53.33% |
| 2001 | 2.40 | 4.35% |
| 2002 | 2.50 | 4.17% |
| 2003 | 2.70 | 8.00% |
| 2004 | 2.70 | 0.00% |
| 2005 | 2.60 | -3.70% |
| 2006 | 2.70 | 3.85% |
| 2007 | 2.90 | 7.41% |
| 2008 | 3.00 | 3.45% |
| 2009 | 2.90 | -3.33% |
| 2010 | 3.00 | 3.45% |
| 2011 | 3.00 | 0.00% |
| 2012 | 3.00 | 0.00% |
| 2013 | 3.00 | 0.00% |
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