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| year | consumption | change |
| 1980 | .09 | NA |
| 1981 | .09 | 2.27% |
| 1982 | .09 | 2.22% |
| 1983 | .10 | 3.26% |
| 1984 | .09 | -2.11% |
| 1985 | .10 | 2.15% |
| 1986 | .10 | 6.32% |
| 1987 | .10 | -3.96% |
| 1988 | .11 | 10.31% |
| 1989 | .11 | 2.80% |
| 1990 | .11 | -4.55% |
| 1991 | .10 | -5.71% |
| 1992 | .11 | 10.10% |
| 1993 | .11 | -3.67% |
| 1994 | .09 | -12.38% |
| 1995 | .10 | 9.78% |
| 1996 | .10 | 1.98% |
| 1997 | .09 | -10.68% |
| 1998 | .09 | -5.43% |
| 1999 | .09 | -1.15% |
| 2000 | .09 | 0.00% |
| 2001 | .08 | -10.47% |
| 2002 | .07 | -3.90% |
| 2003 | .07 | 0.00% |
| 2004 | .09 | 20.27% |
| 2005 | .09 | 3.37% |
| 2006 | .09 | 1.09% |
| 2007 | .10 | 6.45% |
| 2008 | .10 | -3.03% |
| 2009 | .10 | 1.04% |
| 2010 | .11 | 10.31% |
| 2011 | .12 | 8.41% |
| 2012 | .12 | 0.86% |
| 2013 | .10 | -14.53% |
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