|
| year | consumption | change |
| 1980 | .00 | NA |
| 1981 | .00 | NA |
| 1982 | .00 | NA |
| 1983 | .02 | NA |
| 1984 | .04 | 100.00 % |
| 1985 | .06 | 50.00 % |
| 1986 | .14 | 133.33 % |
| 1987 | .18 | 28.57 % |
| 1988 | .30 | 66.67 % |
| 1989 | .44 | 46.67 % |
| 1990 | .80 | 81.82 % |
| 1991 | 1.04 | 30.00 % |
| 1992 | 1.36 | 30.77 % |
| 1993 | 1.67 | 22.79 % |
| 1994 | 1.85 | 10.78 % |
| 1995 | 1.98 | 7.03 % |
| 1996 | 2.28 | 15.15 % |
| 1997 | 3.13 | 37.28 % |
| 1998 | 4.08 | 30.35 % |
| 1999 | 4.59 | 12.50 % |
| 2000 | 5.79 | 26.14 % |
| 2001 | 6.09 | 5.18 % |
| 2002 | 7.01 | 15.11 % |
| 2003 | 8.29 | 18.26 % |
| 2004 | 9.64 | 16.28 % |
| 2005 | 10.15 | 5.29 % |
| 2006 | 9.53 | -6.11 % |
|
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