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| year | consumption | change |
| 1980 | .51 | NA |
| 1981 | .55 | 7.06% |
| 1982 | .54 | -1.65% |
| 1983 | .57 | 6.70% |
| 1984 | .63 | 10.65% |
| 1985 | .70 | 10.57% |
| 1986 | .72 | 2.85% |
| 1987 | .79 | 9.71% |
| 1988 | .91 | 14.54% |
| 1989 | 1.07 | 18.21% |
| 1990 | 1.25 | 16.90% |
| 1991 | 1.37 | 9.42% |
| 1992 | 1.47 | 6.93% |
| 1993 | 1.68 | 14.33% |
| 1994 | 1.87 | 11.46% |
| 1995 | 2.12 | 13.28% |
| 1996 | 2.44 | 15.51% |
| 1997 | 2.59 | 6.10% |
| 1998 | 2.44 | -6.06% |
| 1999 | 2.49 | 2.38% |
| 2000 | 2.56 | 2.77% |
| 2001 | 2.69 | 4.80% |
| 2002 | 2.93 | 9.16% |
| 2003 | 3.20 | 9.25% |
| 2004 | 3.44 | 7.46% |
| 2005 | 3.76 | 9.27% |
| 2006 | 3.90 | 3.64% |
| 2007 | 4.04 | 3.57% |
| 2008 | 4.09 | 1.34% |
| 2009 | 4.25 | 4.01% |
| 2010 | 4.48 | 5.34% |
| 2011 | 4.62 | 3.06% |
| 2012 | 4.83 | 4.55% |
| 2013 | 4.75 | -1.59% |
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