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| year | consumption | change |
| 1980 | .04 | NA |
| 1981 | .04 | 12.82% |
| 1982 | .04 | -2.27% |
| 1983 | .04 | -6.98% |
| 1984 | .04 | 7.50% |
| 1985 | .04 | 0.00% |
| 1986 | .05 | 13.95% |
| 1987 | .05 | -6.12% |
| 1988 | .05 | 4.35% |
| 1989 | .05 | 4.17% |
| 1990 | .06 | 10.00% |
| 1991 | .05 | -9.09% |
| 1992 | .05 | 4.00% |
| 1993 | .06 | 5.77% |
| 1994 | .05 | -10.91% |
| 1995 | .05 | 0.00% |
| 1996 | .05 | 6.12% |
| 1997 | .05 | -7.69% |
| 1998 | .06 | 14.58% |
| 1999 | .06 | 5.45% |
| 2000 | .06 | 0.00% |
| 2001 | .07 | 18.97% |
| 2002 | .08 | 8.70% |
| 2003 | .08 | 1.33% |
| 2004 | .08 | 7.89% |
| 2005 | .09 | 8.54% |
| 2006 | .09 | 3.37% |
| 2007 | .11 | 17.39% |
| 2008 | .12 | 7.41% |
| 2009 | .12 | 4.31% |
| 2010 | .12 | 0.00% |
| 2011 | .12 | 0.00% |
| 2012 | .13 | 5.79% |
| 2013 | .16 | 27.34% |
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