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| year | consumption | change |
| 1980 | .03 | NA |
| 1981 | .03 | -3.57% |
| 1982 | .03 | -3.70% |
| 1983 | .03 | 7.69% |
| 1984 | .03 | 10.71% |
| 1985 | .06 | 77.42% |
| 1986 | .11 | 105.45% |
| 1987 | .17 | 48.67% |
| 1988 | .17 | 3.57% |
| 1989 | .22 | 24.71% |
| 1990 | .23 | 6.45% |
| 1991 | .25 | 6.06% |
| 1992 | .23 | -6.12% |
| 1993 | .26 | 13.48% |
| 1994 | .30 | 15.71% |
| 1995 | .35 | 15.23% |
| 1996 | .36 | 4.31% |
| 1997 | .40 | 10.47% |
| 1998 | .41 | 1.75% |
| 1999 | .42 | 3.92% |
| 2000 | .43 | 1.42% |
| 2001 | .38 | -11.86% |
| 2002 | .39 | 3.96% |
| 2003 | .42 | 6.09% |
| 2004 | .42 | -0.72% |
| 2005 | .41 | -1.20% |
| 2006 | .43 | 3.66% |
| 2007 | .43 | 0.00% |
| 2008 | .44 | 4.24% |
| 2009 | .44 | -1.58% |
| 2010 | .44 | 0.46% |
| 2011 | .47 | 6.39% |
| 2012 | .48 | 2.58% |
| 2013 | .46 | -2.93% |
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