|
| year | consumption | change |
| 1980 | .01 | NA |
| 1981 | .01 | 28.84 % |
| 1982 | .01 | -19.96 % |
| 1983 | .01 | 2.07 % |
| 1984 | .01 | 1.75 % |
| 1985 | .01 | 7.96 % |
| 1986 | .01 | -17.08 % |
| 1987 | .01 | 13.63 % |
| 1988 | .00 | -37.16 % |
| 1989 | .01 | 73.24 % |
| 1990 | .01 | 1.08 % |
| 1991 | .01 | 2.84 % |
| 1992 | .01 | 4.15 % |
| 1993 | .01 | 2.88 % |
| 1994 | .01 | 2.47 % |
| 1995 | .01 | 0.31 % |
| 1996 | .01 | 0.21 % |
| 1997 | .01 | 3.13 % |
| 1998 | .01 | 1.21 % |
| 1999 | .01 | 0.10 % |
| 2000 | .01 | 2.20 % |
| 2001 | .01 | 0.59 % |
| 2002 | .01 | 7.09 % |
| 2003 | .01 | 0.73 % |
| 2004 | .01 | 3.06 % |
| 2005 | .01 | 9.27 % |
| 2006 | .01 | -6.96 % |
| 2007 | .01 | 2.15 % |
| 2008 | .01 | 2.10 % |
| 2009 | .01 | 2.14 % |
| 2010 | .01 | 1.37 % |
|
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