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| year | consumption | change |
| 1980 | .43 | NA |
| 1981 | .45 | 5.14% |
| 1982 | .33 | -26.44% |
| 1983 | .32 | -3.02% |
| 1984 | .36 | 11.84% |
| 1985 | .31 | -13.37% |
| 1986 | .34 | 8.36% |
| 1987 | .35 | 4.15% |
| 1988 | .32 | -8.83% |
| 1989 | .31 | -2.50% |
| 1990 | .30 | -3.85% |
| 1991 | .37 | 24.33% |
| 1992 | .33 | -10.72% |
| 1993 | .35 | 4.20% |
| 1994 | .36 | 2.59% |
| 1995 | .36 | 2.25% |
| 1996 | .37 | 2.75% |
| 1997 | .38 | 2.67% |
| 1998 | .39 | 2.60% |
| 1999 | .33 | -17.01% |
| 2000 | .44 | 34.86% |
| 2001 | .48 | 8.39% |
| 2002 | .48 | 0.84% |
| 2003 | .52 | 7.88% |
| 2004 | .53 | 1.92% |
| 2005 | .51 | -3.02% |
| 2006 | .51 | 0.00% |
| 2007 | .47 | -7.98% |
| 2008 | .42 | -10.99% |
| 2009 | .39 | -6.41% |
| 2010 | .38 | -4.57% |
| 2011 | .36 | -3.72% |
| 2012 | .40 | 9.39% |
| 2013 | .36 | -8.59% |
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