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| year | consumption | change |
| 1980 | .40 | NA |
| 1981 | .36 | -10.08% |
| 1982 | .35 | -0.84% |
| 1983 | .38 | 7.63% |
| 1984 | .38 | 0.79% |
| 1985 | .42 | 9.64% |
| 1986 | .44 | 4.99% |
| 1987 | .45 | 2.26% |
| 1988 | .46 | 2.65% |
| 1989 | .48 | 3.66% |
| 1990 | .51 | 5.82% |
| 1991 | .53 | 4.52% |
| 1992 | .50 | -6.58% |
| 1993 | .51 | 3.22% |
| 1994 | .53 | 3.51% |
| 1995 | .55 | 4.14% |
| 1996 | .59 | 5.79% |
| 1997 | .62 | 5.47% |
| 1998 | .59 | -3.89% |
| 1999 | .56 | -5.90% |
| 2000 | .63 | 12.90% |
| 2001 | .67 | 5.87% |
| 2002 | .70 | 4.50% |
| 2003 | .68 | -1.87% |
| 2004 | .76 | 10.82% |
| 2005 | .77 | 1.85% |
| 2006 | .74 | -4.79% |
| 2007 | .73 | -1.36% |
| 2008 | .76 | 5.10% |
| 2009 | .82 | 8.14% |
| 2010 | .94 | 13.83% |
| 2011 | .57 | -39.45% |
| 2012 | .70 | 23.94% |
| 2013 | .75 | 6.11% |
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