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| year | consumption | change |
| 1980 | .05 | NA |
| 1981 | .05 | 10.64% |
| 1982 | .06 | 15.38% |
| 1983 | .06 | 0.00% |
| 1984 | .06 | 1.67% |
| 1985 | .06 | 4.92% |
| 1986 | .07 | 9.38% |
| 1987 | .07 | -5.71% |
| 1988 | .07 | 0.00% |
| 1989 | .08 | 16.67% |
| 1990 | .08 | 1.30% |
| 1991 | .08 | 1.28% |
| 1992 | .08 | 0.00% |
| 1993 | .07 | -11.39% |
| 1994 | .08 | 7.14% |
| 1995 | .08 | 1.33% |
| 1996 | .08 | 0.00% |
| 1997 | .08 | 5.26% |
| 1998 | .08 | 0.00% |
| 1999 | .08 | -2.50% |
| 2000 | .08 | 3.85% |
| 2001 | .08 | 1.23% |
| 2002 | .08 | -4.88% |
| 2003 | .08 | 6.41% |
| 2004 | .09 | 4.82% |
| 2005 | .09 | -1.15% |
| 2006 | .10 | 15.12% |
| 2007 | .10 | 0.00% |
| 2008 | .11 | 9.09% |
| 2009 | .11 | 0.93% |
| 2010 | .13 | 14.68% |
| 2011 | .13 | 0.00% |
| 2012 | .14 | 9.60% |
| 2013 | .12 | -12.41% |
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