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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | 20.00% |
| 1982 | .02 | 0.00% |
| 1983 | .02 | 0.00% |
| 1984 | .02 | 8.33% |
| 1985 | .03 | 3.85% |
| 1986 | .03 | 3.70% |
| 1987 | .03 | 0.00% |
| 1988 | .03 | 0.00% |
| 1989 | .03 | 0.00% |
| 1990 | .03 | 7.14% |
| 1991 | .03 | 0.00% |
| 1992 | .03 | 0.00% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | 0.00% |
| 1995 | .03 | 10.00% |
| 1996 | .04 | 15.15% |
| 1997 | .04 | 10.53% |
| 1998 | .04 | 11.90% |
| 1999 | .05 | 10.64% |
| 2000 | .05 | 11.54% |
| 2001 | .05 | 1.72% |
| 2002 | .06 | 1.69% |
| 2003 | .05 | -1.67% |
| 2004 | .05 | 0.00% |
| 2005 | .07 | 18.64% |
| 2006 | .07 | 1.43% |
| 2007 | .07 | 12.68% |
| 2008 | .07 | 0.00% |
| 2009 | .07 | -1.25% |
| 2010 | .08 | 3.80% |
| 2011 | .08 | 3.66% |
| 2012 | .08 | 0.00% |
| 2013 | .08 | 0.00% |
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