|
| 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 | 4.08 % |
| 1991 | .48 | -5.88 % |
| 1992 | .46 | -4.17 % |
| 1993 | .47 | 2.17 % |
| 1994 | .46 | -2.13 % |
| 1995 | .58 | 26.09 % |
| 1996 | .58 | 0.00 % |
| 1997 | .56 | -3.45 % |
| 1998 | .58 | 3.57 % |
| 1999 | .57 | -1.72 % |
| 2000 | .62 | 8.77 % |
| 2001 | .67 | 8.06 % |
| 2002 | .57 | -14.93 % |
| 2003 | .95 | 66.67 % |
| 2004 | 1.18 | 24.21 % |
| 2005 | 1.15 | -2.54 % |
| 2006 | 1.16 | 0.87 % |
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