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| year | consumption | change |
| 1980 | .18 | NA |
| 1981 | .19 | 1.64% |
| 1982 | .18 | -5.38% |
| 1983 | .18 | 1.14% |
| 1984 | .18 | 2.25% |
| 1985 | .17 | -8.79% |
| 1986 | .17 | 3.61% |
| 1987 | .18 | 3.49% |
| 1988 | .18 | -1.69% |
| 1989 | .17 | -2.29% |
| 1990 | .18 | 5.85% |
| 1991 | .18 | -1.10% |
| 1992 | .18 | 1.68% |
| 1993 | .18 | 0.00% |
| 1994 | .20 | 12.09% |
| 1995 | .22 | 5.88% |
| 1996 | .19 | -10.19% |
| 1997 | .20 | 2.58% |
| 1998 | .21 | 4.52% |
| 1999 | .21 | -1.44% |
| 2000 | .21 | 0.49% |
| 2001 | .20 | -1.46% |
| 2002 | .20 | 0.00% |
| 2003 | .20 | -3.45% |
| 2004 | .23 | 15.82% |
| 2005 | .22 | -3.08% |
| 2006 | .22 | 1.82% |
| 2007 | .23 | 2.23% |
| 2008 | .15 | -34.93% |
| 2009 | .25 | 66.44% |
| 2010 | .29 | 17.74% |
| 2011 | .31 | 7.53% |
| 2012 | .35 | 10.51% |
| 2013 | .28 | -20.17% |
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