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| year | consumption | change |
| 1980 | .09 | NA |
| 1981 | .09 | -1.15% |
| 1982 | .09 | 5.81% |
| 1983 | .11 | 19.78% |
| 1984 | .09 | -13.76% |
| 1985 | .11 | 13.83% |
| 1986 | .11 | 1.87% |
| 1987 | .13 | 15.60% |
| 1988 | .13 | 6.35% |
| 1989 | .13 | -5.22% |
| 1990 | .14 | 9.45% |
| 1991 | .14 | 1.44% |
| 1992 | .15 | 4.26% |
| 1993 | .14 | -5.44% |
| 1994 | .15 | 5.76% |
| 1995 | .16 | 8.16% |
| 1996 | .17 | 8.81% |
| 1997 | .18 | 5.20% |
| 1998 | .19 | 3.30% |
| 1999 | .21 | 12.77% |
| 2000 | .23 | 10.38% |
| 2001 | .25 | 4.70% |
| 2002 | .25 | 2.86% |
| 2003 | .27 | 6.75% |
| 2004 | .26 | -2.23% |
| 2005 | .27 | 3.42% |
| 2006 | .28 | 2.57% |
| 2007 | .29 | 4.30% |
| 2008 | .31 | 6.53% |
| 2009 | .28 | -10.32% |
| 2010 | .29 | 2.88% |
| 2011 | .30 | 5.59% |
| 2012 | .32 | 4.97% |
| 2013 | .35 | 10.41% |
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