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| year | consumption | change |
| 1980 | .07 | NA |
| 1981 | .07 | 6.15% |
| 1982 | .08 | 21.74% |
| 1983 | .10 | 15.48% |
| 1984 | .10 | 3.09% |
| 1985 | .12 | 19.00% |
| 1986 | .14 | 13.45% |
| 1987 | .14 | 2.96% |
| 1988 | .13 | -6.47% |
| 1989 | .17 | 29.23% |
| 1990 | .18 | 9.52% |
| 1991 | .21 | 14.13% |
| 1992 | .20 | -2.86% |
| 1993 | .23 | 11.27% |
| 1994 | .24 | 4.41% |
| 1995 | .22 | -5.49% |
| 1996 | .23 | 3.13% |
| 1997 | .27 | 16.02% |
| 1998 | .35 | 29.48% |
| 1999 | .30 | -13.26% |
| 2000 | .34 | 13.29% |
| 2001 | .35 | 1.76% |
| 2002 | .36 | 3.75% |
| 2003 | .36 | -0.83% |
| 2004 | .38 | 6.72% |
| 2005 | .48 | 25.98% |
| 2006 | .55 | 14.79% |
| 2007 | .58 | 5.63% |
| 2008 | .75 | 28.01% |
| 2009 | .75 | 0.67% |
| 2010 | .95 | 26.27% |
| 2011 | .97 | 2.85% |
| 2012 | 1.23 | 25.77% |
| 2013 | 1.13 | -8.08% |
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