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| year | consumption | change |
| 1980 | .08 | NA |
| 1981 | .08 | 10.67% |
| 1982 | .07 | -10.84% |
| 1983 | .08 | 2.70% |
| 1984 | .07 | -3.95% |
| 1985 | .07 | -8.22% |
| 1986 | .07 | 1.49% |
| 1987 | .07 | -1.47% |
| 1988 | .08 | 16.42% |
| 1989 | .09 | 11.54% |
| 1990 | .09 | 6.90% |
| 1991 | .09 | -2.15% |
| 1992 | .10 | 7.69% |
| 1993 | .10 | -1.02% |
| 1994 | .11 | 11.34% |
| 1995 | .12 | 13.89% |
| 1996 | .12 | -1.63% |
| 1997 | .14 | 11.57% |
| 1998 | .13 | -6.67% |
| 1999 | .14 | 11.90% |
| 2000 | .16 | 14.89% |
| 2001 | .15 | -10.49% |
| 2002 | .16 | 8.28% |
| 2003 | .20 | 26.11% |
| 2004 | .20 | 2.02% |
| 2005 | .20 | -2.48% |
| 2006 | .21 | 5.58% |
| 2007 | .24 | 12.98% |
| 2008 | .24 | 2.55% |
| 2009 | .24 | -0.83% |
| 2010 | .24 | 1.67% |
| 2011 | .24 | -0.82% |
| 2012 | .30 | 24.48% |
| 2013 | .28 | -8.00% |
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