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| year | consumption | change |
| 1980 | .06 | NA |
| 1981 | .06 | 3.64% |
| 1982 | .06 | -1.75% |
| 1983 | .06 | 8.93% |
| 1984 | .06 | -3.28% |
| 1985 | .06 | 0.00% |
| 1986 | .06 | -1.69% |
| 1987 | .06 | 10.34% |
| 1988 | .07 | 9.38% |
| 1989 | .08 | 8.57% |
| 1990 | .07 | -2.63% |
| 1991 | .08 | 6.76% |
| 1992 | .09 | 17.72% |
| 1993 | .10 | 8.60% |
| 1994 | .10 | 1.98% |
| 1995 | .11 | 2.91% |
| 1996 | .11 | 0.94% |
| 1997 | .12 | 11.21% |
| 1998 | .12 | 2.52% |
| 1999 | .13 | 9.02% |
| 2000 | .14 | 6.02% |
| 2001 | .15 | 4.26% |
| 2002 | .15 | 4.08% |
| 2003 | .16 | 3.27% |
| 2004 | .16 | 2.53% |
| 2005 | .16 | -0.62% |
| 2006 | .17 | 7.45% |
| 2007 | .18 | 5.20% |
| 2008 | .19 | 4.95% |
| 2009 | .18 | -4.71% |
| 2010 | .19 | 1.65% |
| 2011 | .19 | 0.54% |
| 2012 | .19 | 1.61% |
| 2013 | .20 | 3.70% |
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