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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | 11.11% |
| 1982 | .03 | 6.67% |
| 1983 | .04 | 21.88% |
| 1984 | .04 | 0.00% |
| 1985 | .04 | 0.00% |
| 1986 | .04 | 2.56% |
| 1987 | .06 | 57.50% |
| 1988 | .11 | 77.78% |
| 1989 | .11 | -1.79% |
| 1990 | .05 | -54.55% |
| 1991 | .05 | -6.00% |
| 1992 | .03 | -34.04% |
| 1993 | .03 | 0.00% |
| 1994 | .03 | -3.23% |
| 1995 | .03 | -16.67% |
| 1996 | .03 | 0.00% |
| 1997 | .02 | -4.00% |
| 1998 | .02 | -4.17% |
| 1999 | .02 | 0.00% |
| 2000 | .02 | -4.35% |
| 2001 | .02 | -18.18% |
| 2002 | .02 | 0.00% |
| 2003 | .02 | -11.11% |
| 2004 | .02 | 0.00% |
| 2005 | .02 | 31.25% |
| 2006 | .03 | 28.57% |
| 2007 | .04 | 29.63% |
| 2008 | .06 | 71.43% |
| 2009 | .10 | 63.33% |
| 2010 | .12 | 24.49% |
| 2011 | .12 | 0.82% |
| 2012 | .13 | 4.07% |
| 2013 | .13 | -1.56% |
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