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| year | consumption | change |
| 1980 | .13 | NA |
| 1981 | .13 | 0.75% |
| 1982 | .14 | 1.49% |
| 1983 | .14 | -0.74% |
| 1984 | .13 | -3.70% |
| 1985 | .13 | 0.00% |
| 1986 | .13 | -0.77% |
| 1987 | .12 | -6.98% |
| 1988 | .12 | 1.67% |
| 1989 | .11 | -13.93% |
| 1990 | .11 | 7.62% |
| 1991 | .11 | -3.54% |
| 1992 | .11 | 1.83% |
| 1993 | .11 | -4.50% |
| 1994 | .10 | -4.72% |
| 1995 | .10 | 0.99% |
| 1996 | .10 | -5.88% |
| 1997 | .10 | 8.33% |
| 1998 | .10 | -1.92% |
| 1999 | .10 | -2.94% |
| 2000 | .10 | 0.00% |
| 2001 | .11 | 6.06% |
| 2002 | .11 | 2.86% |
| 2003 | .11 | 3.70% |
| 2004 | .12 | 2.68% |
| 2005 | .12 | 5.22% |
| 2006 | .13 | 3.31% |
| 2007 | .13 | 0.00% |
| 2008 | .12 | -4.80% |
| 2009 | .12 | 0.84% |
| 2010 | .13 | 5.00% |
| 2011 | .14 | 12.70% |
| 2012 | .16 | 9.86% |
| 2013 | .17 | 7.69% |
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