|
| year | consumption | change |
| 1980 | .50 | NA |
| 1981 | .49 | -0.94 % |
| 1982 | .50 | 2.04 % |
| 1983 | .53 | 5.07 % |
| 1984 | .56 | 6.60 % |
| 1985 | .58 | 2.11 % |
| 1986 | .62 | 8.40 % |
| 1987 | .63 | 0.84 % |
| 1988 | .67 | 7.24 % |
| 1989 | .67 | 0.00 % |
| 1990 | .71 | 4.69 % |
| 1991 | .71 | 0.57 % |
| 1992 | .70 | -1.12 % |
| 1993 | .72 | 3.21 % |
| 1994 | .77 | 6.40 % |
| 1995 | .78 | 0.70 % |
| 1996 | .77 | -1.01 % |
| 1997 | .79 | 2.17 % |
| 1998 | .77 | -1.53 % |
| 1999 | .81 | 4.94 % |
| 2000 | .83 | 1.82 % |
| 2001 | .84 | 1.17 % |
| 2002 | .85 | 2.15 % |
| 2003 | .85 | -1.01 % |
| 2004 | .88 | 3.73 % |
| 2005 | .84 | -3.64 % |
| 2006 | .86 | 1.94 % |
| 2007 | .86 | 0.05 % |
| 2008 | .85 | -1.08 % |
| 2009 | .84 | -1.17 % |
| 2010 | .86 | 1.79 % |
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