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| year | consumption | change |
| 1980 | .80 | NA |
| 1981 | .80 | 0.00% |
| 1982 | .80 | 0.00% |
| 1983 | .80 | 0.00% |
| 1984 | .80 | 0.00% |
| 1985 | 1.00 | 25.00% |
| 1986 | 1.30 | 30.00% |
| 1987 | 1.30 | 0.00% |
| 1988 | 1.80 | 38.46% |
| 1989 | 1.80 | 0.00% |
| 1990 | 2.00 | 11.11% |
| 1991 | 1.90 | -5.00% |
| 1992 | 1.70 | -10.53% |
| 1993 | 1.70 | 0.00% |
| 1994 | 1.40 | -17.65% |
| 1995 | 1.60 | 14.29% |
| 1996 | 2.20 | 37.50% |
| 1997 | 2.40 | 9.09% |
| 1998 | 2.60 | 8.33% |
| 1999 | 2.50 | -3.85% |
| 2000 | 3.10 | 24.00% |
| 2001 | 3.20 | 3.23% |
| 2002 | 3.40 | 6.25% |
| 2003 | 3.70 | 8.82% |
| 2004 | 3.90 | 5.41% |
| 2005 | 4.10 | 5.13% |
| 2006 | 4.20 | 2.44% |
| 2007 | 4.70 | 11.90% |
| 2008 | 4.90 | 4.26% |
| 2009 | 4.80 | -2.04% |
| 2010 | 4.90 | 2.08% |
| 2011 | 5.20 | 6.12% |
| 2012 | 5.20 | 0.00% |
| 2013 | 5.40 | 3.85% |
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