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| year | consumption | change |
| 1980 | .60 | NA |
| 1981 | .60 | 0.00 % |
| 1982 | .70 | 16.67 % |
| 1983 | .70 | 0.00 % |
| 1984 | .80 | 14.29 % |
| 1985 | .80 | 0.00 % |
| 1986 | .90 | 12.50 % |
| 1987 | 1.10 | 22.22 % |
| 1988 | 1.20 | 9.09 % |
| 1989 | 1.20 | 0.00 % |
| 1990 | 1.10 | -8.33 % |
| 1991 | 1.10 | 0.00 % |
| 1992 | 1.10 | 0.00 % |
| 1993 | 1.30 | 18.18 % |
| 1994 | 1.30 | 0.00 % |
| 1995 | 1.30 | 0.00 % |
| 1996 | 1.40 | 7.69 % |
| 1997 | 1.40 | 0.00 % |
| 1998 | 1.50 | 7.14 % |
| 1999 | 1.50 | 0.00 % |
| 2000 | 1.50 | 0.00 % |
| 2001 | 1.80 | 20.00 % |
| 2002 | 1.80 | 0.00 % |
| 2003 | 2.00 | 11.11 % |
| 2004 | 2.30 | 15.00 % |
| 2005 | 2.50 | 8.70 % |
| 2006 | 2.90 | 16.00 % |
| 2007 | 3.10 | 6.90 % |
| 2008 | 3.30 | 6.45 % |
| 2009 | 3.50 | 6.06 % |
| 2010 | 4.20 | 20.00 % |
| 2011 | 4.70 | 11.90 % |
| 2012 | 5.20 | 10.64 % |
| 2013 | 6.00 | 15.38 % |
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