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| year | consumption | change |
| 1980 | .44 | NA |
| 1981 | .42 | -4.14% |
| 1982 | .36 | -14.39% |
| 1983 | .39 | 9.52% |
| 1984 | .40 | 2.81% |
| 1985 | .40 | -0.25% |
| 1986 | .41 | 1.75% |
| 1987 | .42 | 3.43% |
| 1988 | .47 | 10.66% |
| 1989 | .52 | 12.21% |
| 1990 | .59 | 13.17% |
| 1991 | .59 | -0.51% |
| 1992 | .65 | 9.66% |
| 1993 | .69 | 6.34% |
| 1994 | .74 | 7.56% |
| 1995 | .81 | 8.92% |
| 1996 | .87 | 7.82% |
| 1997 | .98 | 13.12% |
| 1998 | .97 | -1.12% |
| 1999 | 1.01 | 4.22% |
| 2000 | 1.02 | 0.59% |
| 2001 | 1.05 | 2.75% |
| 2002 | 1.07 | 2.58% |
| 2003 | 1.14 | 5.68% |
| 2004 | 1.22 | 7.22% |
| 2005 | 1.28 | 5.18% |
| 2006 | 1.31 | 2.58% |
| 2007 | 1.30 | -0.76% |
| 2008 | 1.36 | 4.53% |
| 2009 | 1.36 | -0.51% |
| 2010 | 1.32 | -2.51% |
| 2011 | 1.37 | 3.33% |
| 2012 | 1.36 | -0.51% |
| 2013 | 1.35 | -0.96% |
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