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| year | consumption | change |
| 1980 | .62 | NA |
| 1981 | .68 | 9.29% |
| 1982 | .78 | 13.93% |
| 1983 | .79 | 1.67% |
| 1984 | .82 | 3.29% |
| 1985 | .88 | 7.23% |
| 1986 | .93 | 6.74% |
| 1987 | 1.01 | 8.03% |
| 1988 | 1.08 | 7.04% |
| 1989 | 1.13 | 5.00% |
| 1990 | 1.19 | 4.94% |
| 1991 | 1.25 | 5.21% |
| 1992 | 1.31 | 4.79% |
| 1993 | 1.40 | 6.94% |
| 1994 | 1.53 | 8.98% |
| 1995 | 1.60 | 4.32% |
| 1996 | 1.67 | 4.76% |
| 1997 | 1.69 | 0.84% |
| 1998 | 1.72 | 2.02% |
| 1999 | 1.80 | 4.94% |
| 2000 | 1.85 | 2.33% |
| 2001 | 1.80 | -2.55% |
| 2002 | 1.81 | 0.78% |
| 2003 | 1.91 | 5.30% |
| 2004 | 1.97 | 3.04% |
| 2005 | 2.14 | 8.80% |
| 2006 | 2.39 | 11.45% |
| 2007 | 2.48 | 4.07% |
| 2008 | 2.47 | -0.52% |
| 2009 | 2.51 | 1.50% |
| 2010 | 2.61 | 4.11% |
| 2011 | 2.54 | -2.49% |
| 2012 | 2.64 | 3.69% |
| 2013 | 2.65 | 0.49% |
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