|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | -13.49 % |
| 1982 | .01 | 5.98 % |
| 1983 | .01 | 6.05 % |
| 1984 | .01 | -2.46 % |
| 1985 | .01 | -1.46 % |
| 1986 | .01 | -5.53 % |
| 1987 | .01 | 41.14 % |
| 1988 | .01 | 9.31 % |
| 1989 | .01 | 21.76 % |
| 1990 | .01 | -29.43 % |
| 1991 | .01 | -13.25 % |
| 1992 | .01 | -19.63 % |
| 1993 | .01 | 7.42 % |
| 1994 | .01 | 6.91 % |
| 1995 | .01 | -0.54 % |
| 1996 | .01 | 1.49 % |
| 1997 | .01 | 0.27 % |
| 1998 | .01 | 0.00 % |
| 1999 | .01 | 0.00 % |
| 2000 | .01 | -0.27 % |
| 2001 | .01 | -0.80 % |
| 2002 | .01 | 1.08 % |
| 2003 | .01 | 8.24 % |
| 2004 | .01 | 6.76 % |
| 2005 | .01 | 6.67 % |
| 2006 | .01 | -0.54 % |
| 2007 | .01 | 10.41 % |
| 2008 | .01 | -3.63 % |
| 2009 | .01 | -1.02 % |
| 2010 | .01 | -1.65 % |
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