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| year | consumption | change |
| 1980 | .02 | NA |
| 1981 | .02 | 23.74% |
| 1982 | .03 | 11.63% |
| 1983 | .02 | -10.92% |
| 1984 | .03 | 12.84% |
| 1985 | .03 | 13.15% |
| 1986 | .04 | 20.78% |
| 1987 | .04 | 14.26% |
| 1988 | .04 | -10.07% |
| 1989 | .04 | 15.30% |
| 1990 | .05 | 6.60% |
| 1991 | .06 | 19.08% |
| 1992 | .05 | -10.72% |
| 1993 | .08 | 49.36% |
| 1994 | .09 | 20.12% |
| 1995 | .10 | 10.05% |
| 1996 | .20 | 100.00% |
| 1997 | .40 | 100.00% |
| 1998 | .30 | -25.00% |
| 1999 | .30 | 0.00% |
| 2000 | .30 | 0.00% |
| 2001 | .40 | 33.33% |
| 2002 | .50 | 25.00% |
| 2003 | .60 | 20.00% |
| 2004 | .60 | 0.00% |
| 2005 | .60 | 0.00% |
| 2006 | .70 | 16.67% |
| 2007 | .90 | 28.57% |
| 2008 | 1.10 | 22.22% |
| 2009 | 1.40 | 27.27% |
| 2010 | 1.80 | 28.57% |
| 2011 | 1.60 | -11.11% |
| 2012 | 1.70 | 6.25% |
| 2013 | 2.00 | 17.65% |
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