|
| year | consumption | change |
| 1980 | .10 | NA |
| 1981 | .10 | 2.80 % |
| 1982 | .10 | -0.95 % |
| 1983 | .10 | -0.52 % |
| 1984 | .10 | -1.32 % |
| 1985 | .10 | 4.13 % |
| 1986 | .11 | 6.12 % |
| 1987 | .10 | -8.19 % |
| 1988 | .11 | 12.61 % |
| 1989 | .12 | 7.85 % |
| 1990 | .12 | 1.82 % |
| 1991 | .11 | -7.52 % |
| 1992 | .12 | 7.53 % |
| 1993 | .12 | -1.46 % |
| 1994 | .13 | 8.75 % |
| 1995 | .14 | 4.00 % |
| 1996 | .14 | 4.06 % |
| 1997 | .13 | -6.48 % |
| 1998 | .15 | 10.46 % |
| 1999 | .14 | -4.54 % |
| 2000 | .14 | 0.61 % |
| 2001 | .14 | 1.33 % |
| 2002 | .15 | 3.61 % |
| 2003 | .16 | 7.93 % |
| 2004 | .17 | 4.70 % |
| 2005 | .18 | 8.43 % |
| 2006 | .20 | 9.86 % |
| 2007 | .20 | 0.59 % |
| 2008 | .19 | -6.84 % |
| 2009 | .20 | 4.90 % |
| 2010 | .22 | 11.27 % |
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