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| year | consumption | change |
| 1980 | .25 | NA |
| 1981 | .22 | -10.40% |
| 1982 | .16 | -27.23% |
| 1983 | .11 | -30.06% |
| 1984 | .13 | 17.54% |
| 1985 | .15 | 11.94% |
| 1986 | .10 | -33.33% |
| 1987 | .12 | 17.00% |
| 1988 | .08 | -29.91% |
| 1989 | .13 | 52.44% |
| 1990 | .12 | -7.20% |
| 1991 | .12 | 2.59% |
| 1992 | .12 | 1.68% |
| 1993 | .12 | -0.83% |
| 1994 | .12 | 2.50% |
| 1995 | .12 | -0.81% |
| 1996 | .12 | -0.82% |
| 1997 | .12 | 1.65% |
| 1998 | .13 | 4.07% |
| 1999 | .31 | 139.06% |
| 2000 | .14 | -54.58% |
| 2001 | .19 | 38.13% |
| 2002 | .19 | -0.52% |
| 2003 | .23 | 17.80% |
| 2004 | .24 | 4.44% |
| 2005 | .23 | -4.26% |
| 2006 | .24 | 6.22% |
| 2007 | .22 | -6.69% |
| 2008 | .19 | -16.14% |
| 2009 | .22 | 19.25% |
| 2010 | .21 | -4.48% |
| 2011 | .23 | 8.45% |
| 2012 | .23 | 0.87% |
| 2013 | .24 | 1.72% |
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