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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | 14.29% |
| 1982 | .03 | -6.25% |
| 1983 | .04 | 36.67% |
| 1984 | .04 | -9.76% |
| 1985 | .03 | -13.51% |
| 1986 | .03 | -9.38% |
| 1987 | .03 | 13.79% |
| 1988 | .04 | 6.06% |
| 1989 | .04 | 25.71% |
| 1990 | .04 | -2.27% |
| 1991 | .04 | 2.33% |
| 1992 | .05 | 4.55% |
| 1993 | .04 | -6.52% |
| 1994 | .04 | 2.33% |
| 1995 | .04 | -4.55% |
| 1996 | .04 | 2.38% |
| 1997 | .05 | 6.98% |
| 1998 | .04 | -4.35% |
| 1999 | .04 | -9.09% |
| 2000 | .04 | -7.50% |
| 2001 | .04 | 2.70% |
| 2002 | .04 | 0.00% |
| 2003 | .04 | 2.63% |
| 2004 | .04 | 0.00% |
| 2005 | .04 | -2.56% |
| 2006 | .04 | 10.53% |
| 2007 | .05 | 7.14% |
| 2008 | .05 | 11.11% |
| 2009 | .05 | 4.00% |
| 2010 | .05 | -3.85% |
| 2011 | .05 | -4.00% |
| 2012 | .06 | 27.08% |
| 2013 | .07 | 6.56% |
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