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| year | consumption | change |
| 1980 | .40 | NA |
| 1981 | .43 | 6.75% |
| 1982 | .43 | -0.47% |
| 1983 | .40 | -6.12% |
| 1984 | .41 | 2.76% |
| 1985 | .41 | 0.73% |
| 1986 | .45 | 7.99% |
| 1987 | .45 | 1.35% |
| 1988 | .45 | -0.66% |
| 1989 | .41 | -9.80% |
| 1990 | .38 | -5.43% |
| 1991 | .38 | -1.31% |
| 1992 | .37 | -1.59% |
| 1993 | .43 | 14.25% |
| 1994 | .45 | 5.65% |
| 1995 | .47 | 4.90% |
| 1996 | .50 | 5.94% |
| 1997 | .48 | -3.81% |
| 1998 | .50 | 3.75% |
| 1999 | .51 | 2.21% |
| 2000 | .52 | 2.75% |
| 2001 | .53 | 1.72% |
| 2002 | .54 | 1.69% |
| 2003 | .55 | 1.66% |
| 2004 | .58 | 5.64% |
| 2005 | .61 | 4.65% |
| 2006 | .67 | 10.03% |
| 2007 | .68 | 1.20% |
| 2008 | .77 | 14.18% |
| 2009 | .75 | -2.72% |
| 2010 | .88 | 16.76% |
| 2011 | .91 | 3.19% |
| 2012 | .97 | 7.17% |
| 2013 | .86 | -11.53% |
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