|
| year | consumption | change |
| 1980 | .09 | NA |
| 1981 | .08 | -11.11 % |
| 1982 | .10 | 25.00 % |
| 1983 | .14 | 40.00 % |
| 1984 | .09 | -35.71 % |
| 1985 | .11 | 22.22 % |
| 1986 | .10 | -9.09 % |
| 1987 | .10 | 0.00 % |
| 1988 | .12 | 20.00 % |
| 1989 | .11 | -8.33 % |
| 1990 | .10 | -9.09 % |
| 1991 | .10 | 0.00 % |
| 1992 | .10 | 0.00 % |
| 1993 | .10 | 0.00 % |
| 1994 | .11 | 10.00 % |
| 1995 | .11 | 0.00 % |
| 1996 | .35 | 218.18 % |
| 1997 | .44 | 25.71 % |
| 1998 | .48 | 9.09 % |
| 1999 | .55 | 14.58 % |
| 2000 | .67 | 21.82 % |
| 2001 | .65 | -2.99 % |
| 2002 | .91 | 40.00 % |
| 2003 | 1.07 | 17.58 % |
| 2004 | 1.20 | 12.15 % |
| 2005 | 1.31 | 9.17 % |
| 2006 | 1.39 | 6.11 % |
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