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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | -6.06% |
| 1982 | .03 | 3.23% |
| 1983 | .03 | 3.13% |
| 1984 | .03 | 3.03% |
| 1985 | .03 | -5.88% |
| 1986 | .04 | 18.75% |
| 1987 | .04 | -5.26% |
| 1988 | .05 | 25.00% |
| 1989 | .05 | 17.78% |
| 1990 | .06 | 11.32% |
| 1991 | .06 | 0.00% |
| 1992 | .06 | 1.69% |
| 1993 | .06 | 1.67% |
| 1994 | .06 | 0.00% |
| 1995 | .07 | 6.56% |
| 1996 | .07 | 12.31% |
| 1997 | .08 | 2.74% |
| 1998 | .08 | 6.67% |
| 1999 | .09 | 8.75% |
| 2000 | .09 | -1.15% |
| 2001 | .09 | 8.14% |
| 2002 | .10 | 5.38% |
| 2003 | .10 | 2.04% |
| 2004 | .11 | 9.00% |
| 2005 | .12 | 8.26% |
| 2006 | .12 | 2.54% |
| 2007 | .13 | 9.92% |
| 2008 | .13 | -2.26% |
| 2009 | .12 | -4.62% |
| 2010 | .13 | 5.65% |
| 2011 | .14 | 3.82% |
| 2012 | .15 | 8.82% |
| 2013 | .16 | 5.41% |
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