|
| year | consumption | change |
| 1980 | .13 | NA |
| 1981 | .18 | 38.46 % |
| 1982 | .24 | 33.33 % |
| 1983 | .40 | 66.67 % |
| 1984 | .37 | -7.50 % |
| 1985 | .48 | 29.73 % |
| 1986 | .52 | 8.33 % |
| 1987 | .53 | 1.92 % |
| 1988 | .48 | -9.43 % |
| 1989 | .49 | 2.08 % |
| 1990 | .51 | 4.69 % |
| 1991 | .49 | -4.48 % |
| 1992 | .47 | -4.08 % |
| 1993 | .48 | 2.13 % |
| 1994 | .47 | -2.08 % |
| 1995 | .59 | 25.53 % |
| 1996 | .65 | 10.17 % |
| 1997 | .71 | 9.38 % |
| 1998 | .84 | 18.28 % |
| 1999 | .81 | -3.57 % |
| 2000 | 1.14 | 40.69 % |
| 2001 | 1.40 | 22.96 % |
| 2002 | 1.28 | -8.62 % |
| 2003 | 1.83 | 42.98 % |
| 2004 | 2.22 | 21.28 % |
| 2005 | 2.22 | 0.00 % |
| 2006 | 2.28 | 2.34 % |
|
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