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| year | consumption | change |
| 1980 | .33 | NA |
| 1981 | .31 | -4.28% |
| 1982 | .31 | -0.64% |
| 1983 | .31 | -0.96% |
| 1984 | .31 | -0.32% |
| 1985 | .31 | 1.95% |
| 1986 | .34 | 8.63% |
| 1987 | .34 | 0.00% |
| 1988 | .33 | -2.06% |
| 1989 | .35 | 5.11% |
| 1990 | .36 | 3.71% |
| 1991 | .38 | 4.96% |
| 1992 | .39 | 1.57% |
| 1993 | .40 | 2.84% |
| 1994 | .42 | 5.53% |
| 1995 | .43 | 2.62% |
| 1996 | .46 | 6.26% |
| 1997 | .49 | 6.77% |
| 1998 | .53 | 8.79% |
| 1999 | .57 | 6.20% |
| 2000 | .60 | 6.37% |
| 2001 | .63 | 4.66% |
| 2002 | .62 | -1.11% |
| 2003 | .62 | -0.64% |
| 2004 | .64 | 4.21% |
| 2005 | .66 | 2.95% |
| 2006 | .70 | 5.13% |
| 2007 | .69 | -0.72% |
| 2008 | .69 | 0.14% |
| 2009 | .62 | -10.53% |
| 2010 | .63 | 2.26% |
| 2011 | .59 | -7.73% |
| 2012 | .57 | -2.39% |
| 2013 | .58 | 0.88% |
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