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| year | consumption | change |
| 1980 | .10 | NA |
| 1981 | .10 | 2.08% |
| 1982 | .12 | 17.35% |
| 1983 | .10 | -9.57% |
| 1984 | .13 | 26.92% |
| 1985 | .15 | 11.36% |
| 1986 | .14 | -4.08% |
| 1987 | .14 | -0.71% |
| 1988 | .14 | 2.86% |
| 1989 | .15 | 6.94% |
| 1990 | .16 | 3.90% |
| 1991 | .17 | 3.75% |
| 1992 | .17 | 4.22% |
| 1993 | .14 | -17.92% |
| 1994 | .14 | -2.82% |
| 1995 | .15 | 8.70% |
| 1996 | .15 | 2.00% |
| 1997 | .16 | 3.92% |
| 1998 | .17 | 7.55% |
| 1999 | .18 | 4.68% |
| 2000 | .19 | 8.38% |
| 2001 | .21 | 6.19% |
| 2002 | .23 | 9.71% |
| 2003 | .24 | 7.96% |
| 2004 | .25 | 0.82% |
| 2005 | .26 | 4.47% |
| 2006 | .28 | 8.95% |
| 2007 | .26 | -8.93% |
| 2008 | .31 | 22.35% |
| 2009 | .29 | -7.37% |
| 2010 | .36 | 25.26% |
| 2011 | .31 | -15.19% |
| 2012 | .29 | -5.86% |
| 2013 | .33 | 12.80% |
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