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| year | consumption | change |
| 1980 | .08 | NA |
| 1981 | .08 | -8.43% |
| 1982 | .09 | 18.42% |
| 1983 | .09 | 2.22% |
| 1984 | .09 | -2.17% |
| 1985 | .10 | 15.56% |
| 1986 | .11 | 6.73% |
| 1987 | .12 | 5.41% |
| 1988 | .12 | 4.27% |
| 1989 | .12 | -4.92% |
| 1990 | .11 | -6.03% |
| 1991 | .13 | 17.43% |
| 1992 | .11 | -14.06% |
| 1993 | .10 | -10.00% |
| 1994 | .09 | -6.06% |
| 1995 | .10 | 7.53% |
| 1996 | .08 | -25.00% |
| 1997 | .06 | -17.33% |
| 1998 | .06 | -1.61% |
| 1999 | .06 | 1.64% |
| 2000 | .06 | 1.61% |
| 2001 | .07 | 3.17% |
| 2002 | .07 | 7.69% |
| 2003 | .07 | -5.71% |
| 2004 | .07 | 7.58% |
| 2005 | .07 | 1.41% |
| 2006 | .08 | 13.89% |
| 2007 | .09 | 3.66% |
| 2008 | .09 | 7.06% |
| 2009 | .09 | -1.10% |
| 2010 | .10 | 7.78% |
| 2011 | .14 | 44.33% |
| 2012 | .16 | 10.71% |
| 2013 | .16 | 5.81% |
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