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| year | consumption | change |
| 1980 | .09 | NA |
| 1981 | .08 | -8.05% |
| 1982 | .08 | -3.75% |
| 1983 | .07 | -3.90% |
| 1984 | .07 | -1.35% |
| 1985 | .08 | 4.11% |
| 1986 | .08 | 5.26% |
| 1987 | .09 | 12.50% |
| 1988 | .09 | 1.11% |
| 1989 | .10 | 9.89% |
| 1990 | .11 | 7.00% |
| 1991 | .12 | 13.08% |
| 1992 | .13 | 3.31% |
| 1993 | .13 | 1.60% |
| 1994 | .13 | 2.36% |
| 1995 | .13 | -3.85% |
| 1996 | .13 | 5.60% |
| 1997 | .14 | 3.03% |
| 1998 | .14 | 1.47% |
| 1999 | .15 | 5.80% |
| 2000 | .16 | 6.16% |
| 2001 | .16 | 5.16% |
| 2002 | .17 | 4.29% |
| 2003 | .18 | 5.29% |
| 2004 | .20 | 12.29% |
| 2005 | .20 | 1.00% |
| 2006 | .20 | -0.99% |
| 2007 | .20 | -1.99% |
| 2008 | .20 | 0.00% |
| 2009 | .19 | -5.58% |
| 2010 | .20 | 5.91% |
| 2011 | .19 | -2.03% |
| 2012 | .19 | -2.07% |
| 2013 | .19 | -2.12% |
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