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| year | consumption | change |
| 1980 | .12 | NA |
| 1981 | .10 | -15.25% |
| 1982 | .09 | -13.00% |
| 1983 | .09 | 5.75% |
| 1984 | .08 | -18.48% |
| 1985 | .07 | -9.33% |
| 1986 | .07 | 0.00% |
| 1987 | .07 | 7.35% |
| 1988 | .09 | 16.44% |
| 1989 | .10 | 15.29% |
| 1990 | .10 | 5.10% |
| 1991 | .11 | 1.94% |
| 1992 | .12 | 10.48% |
| 1993 | .12 | 0.86% |
| 1994 | .12 | 4.27% |
| 1995 | .13 | 9.84% |
| 1996 | .14 | 2.24% |
| 1997 | .15 | 5.84% |
| 1998 | .15 | 2.07% |
| 1999 | .15 | 2.70% |
| 2000 | .15 | -3.95% |
| 2001 | .15 | 0.68% |
| 2002 | .15 | 2.72% |
| 2003 | .16 | 3.31% |
| 2004 | .16 | 1.28% |
| 2005 | .15 | -3.80% |
| 2006 | .17 | 12.50% |
| 2007 | .18 | 5.26% |
| 2008 | .17 | -3.33% |
| 2009 | .13 | -25.86% |
| 2010 | .11 | -11.63% |
| 2011 | .12 | 6.14% |
| 2012 | .12 | -4.13% |
| 2013 | .15 | 27.59% |
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