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| year | consumption | change |
| 1980 | .19 | NA |
| 1981 | .19 | 3.21% |
| 1982 | .21 | 9.33% |
| 1983 | .20 | -6.64% |
| 1984 | .21 | 5.58% |
| 1985 | .22 | 6.25% |
| 1986 | .24 | 7.24% |
| 1987 | .23 | -1.27% |
| 1988 | .24 | 3.42% |
| 1989 | .24 | -2.07% |
| 1990 | .25 | 7.17% |
| 1991 | .27 | 5.51% |
| 1992 | .30 | 11.19% |
| 1993 | .29 | -3.36% |
| 1994 | .32 | 9.38% |
| 1995 | .31 | -2.22% |
| 1996 | .33 | 7.79% |
| 1997 | .34 | 3.31% |
| 1998 | .35 | 2.04% |
| 1999 | .34 | -4.00% |
| 2000 | .35 | 2.68% |
| 2001 | .36 | 4.64% |
| 2002 | .37 | 1.11% |
| 2003 | .38 | 2.74% |
| 2004 | .39 | 4.53% |
| 2005 | .42 | 7.91% |
| 2006 | .46 | 9.46% |
| 2007 | .52 | 11.88% |
| 2008 | .57 | 10.81% |
| 2009 | .58 | 1.57% |
| 2010 | .59 | 1.72% |
| 2011 | .62 | 4.38% |
| 2012 | .65 | 5.01% |
| 2013 | .65 | -0.77% |
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