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| year | consumption | change |
| 1980 | .17 | NA |
| 1981 | .19 | 8.14% |
| 1982 | .21 | 10.75% |
| 1983 | .21 | 0.97% |
| 1984 | .21 | 0.96% |
| 1985 | .21 | 0.48% |
| 1986 | .23 | 7.58% |
| 1987 | .26 | 13.22% |
| 1988 | .26 | 0.78% |
| 1989 | .26 | 1.54% |
| 1990 | .27 | 4.18% |
| 1991 | .29 | 5.11% |
| 1992 | .31 | 8.68% |
| 1993 | .37 | 18.85% |
| 1994 | .41 | 11.29% |
| 1995 | .50 | 20.05% |
| 1996 | .59 | 18.91% |
| 1997 | .58 | -1.35% |
| 1998 | .61 | 4.80% |
| 1999 | .68 | 11.78% |
| 2000 | .74 | 7.76% |
| 2001 | .81 | 10.46% |
| 2002 | .90 | 10.95% |
| 2003 | .98 | 8.20% |
| 2004 | 1.09 | 11.17% |
| 2005 | 1.25 | 15.30% |
| 2006 | 1.32 | 5.60% |
| 2007 | 1.47 | 10.98% |
| 2008 | 1.63 | 11.19% |
| 2009 | 1.83 | 11.96% |
| 2010 | 2.03 | 10.96% |
| 2011 | 2.17 | 7.16% |
| 2012 | 2.38 | 9.77% |
| 2013 | 2.34 | -1.97% |
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