|
| year | consumption | change |
| 1980 | .34 | NA |
| 1981 | .40 | 17.65 % |
| 1982 | .46 | 15.00 % |
| 1983 | .53 | 15.22 % |
| 1984 | .52 | -1.89 % |
| 1985 | .58 | 11.54 % |
| 1986 | .51 | -12.07 % |
| 1987 | .54 | 5.88 % |
| 1988 | .64 | 18.52 % |
| 1989 | .62 | -3.12 % |
| 1990 | .68 | 9.68 % |
| 1991 | .68 | 0.00 % |
| 1992 | .74 | 8.82 % |
| 1993 | .80 | 8.11 % |
| 1994 | .96 | 20.00 % |
| 1995 | 1.53 | 59.38 % |
| 1996 | 1.80 | 17.65 % |
| 1997 | 2.70 | 50.00 % |
| 1998 | 3.36 | 24.44 % |
| 1999 | 4.96 | 47.62 % |
| 2000 | 6.50 | 31.05 % |
| 2001 | 8.31 | 27.85 % |
| 2002 | 11.63 | 39.95 % |
| 2003 | 14.85 | 27.69 % |
| 2004 | 18.78 | 26.46 % |
| 2005 | 24.43 | 30.09 % |
| 2006 | 26.75 | 9.50 % |
|
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