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| year | consumption | change |
| 1980 | .04 | NA |
| 1981 | .04 | -2.70% |
| 1982 | .04 | 2.78% |
| 1983 | .04 | -5.41% |
| 1984 | .04 | 20.00% |
| 1985 | .04 | -2.38% |
| 1986 | .04 | -2.44% |
| 1987 | .04 | 2.50% |
| 1988 | .04 | -14.63% |
| 1989 | .04 | 2.86% |
| 1990 | .04 | 0.00% |
| 1991 | .03 | -5.56% |
| 1992 | .04 | 20.59% |
| 1993 | .04 | 2.44% |
| 1994 | .05 | 21.43% |
| 1995 | .06 | 7.84% |
| 1996 | .06 | 1.82% |
| 1997 | .05 | -8.93% |
| 1998 | .05 | 5.88% |
| 1999 | .06 | 11.11% |
| 2000 | .06 | 6.67% |
| 2001 | .06 | 0.00% |
| 2002 | .07 | 4.69% |
| 2003 | .07 | 1.49% |
| 2004 | .08 | 14.71% |
| 2005 | .08 | 7.69% |
| 2006 | .09 | 2.38% |
| 2007 | .09 | 3.49% |
| 2008 | .09 | 2.25% |
| 2009 | .09 | -5.49% |
| 2010 | .09 | 6.98% |
| 2011 | .10 | 4.35% |
| 2012 | .09 | -2.08% |
| 2013 | .10 | 8.51% |
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