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| year | consumption | change |
| 1980 | .11 | NA |
| 1981 | .10 | -4.59% |
| 1982 | .10 | -5.77% |
| 1983 | .12 | 22.45% |
| 1984 | .12 | -2.50% |
| 1985 | .11 | -7.69% |
| 1986 | .11 | 5.56% |
| 1987 | .12 | 7.02% |
| 1988 | .12 | -2.46% |
| 1989 | .11 | -11.76% |
| 1990 | .13 | 27.62% |
| 1991 | .12 | -10.45% |
| 1992 | .14 | 14.17% |
| 1993 | .14 | 2.19% |
| 1994 | .14 | -1.43% |
| 1995 | .13 | -9.42% |
| 1996 | .13 | 3.20% |
| 1997 | .14 | 10.08% |
| 1998 | .18 | 25.35% |
| 1999 | .16 | -10.11% |
| 2000 | .16 | 2.50% |
| 2001 | .16 | -1.22% |
| 2002 | .17 | 3.70% |
| 2003 | .16 | -3.57% |
| 2004 | .14 | -12.96% |
| 2005 | .16 | 11.35% |
| 2006 | .15 | -5.10% |
| 2007 | .18 | 19.46% |
| 2008 | .18 | 3.37% |
| 2009 | .19 | 3.26% |
| 2010 | .21 | 9.47% |
| 2011 | .20 | -2.40% |
| 2012 | .20 | 0.49% |
| 2013 | .19 | -6.86% |
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