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| year | consumption | change |
| 1980 | .15 | NA |
| 1981 | .15 | -0.68% |
| 1982 | .14 | -1.38% |
| 1983 | .15 | 2.80% |
| 1984 | .15 | -0.68% |
| 1985 | .15 | 5.48% |
| 1986 | .17 | 10.39% |
| 1987 | .20 | 14.71% |
| 1988 | .19 | -2.05% |
| 1989 | .21 | 7.85% |
| 1990 | .23 | 12.14% |
| 1991 | .25 | 8.66% |
| 1992 | .24 | -4.78% |
| 1993 | .21 | -10.46% |
| 1994 | .20 | -7.94% |
| 1995 | .20 | 0.00% |
| 1996 | .20 | 3.05% |
| 1997 | .20 | -1.48% |
| 1998 | .20 | 2.00% |
| 1999 | .24 | 15.20% |
| 2000 | .23 | -4.26% |
| 2001 | .21 | -4.89% |
| 2002 | .21 | -1.87% |
| 2003 | .20 | -4.29% |
| 2004 | .18 | -12.94% |
| 2005 | .19 | 9.71% |
| 2006 | .20 | 1.56% |
| 2007 | .18 | -6.15% |
| 2008 | .16 | -12.57% |
| 2009 | .16 | -1.87% |
| 2010 | .17 | 5.73% |
| 2011 | .17 | -0.60% |
| 2012 | .17 | 3.64% |
| 2013 | .18 | 3.51% |
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