|
| year | consumption | change |
| 1980 | .55 | NA |
| 1981 | .54 | -3.03 % |
| 1982 | .54 | 0.79 % |
| 1983 | .52 | -3.16 % |
| 1984 | .50 | -3.98 % |
| 1985 | .49 | -3.36 % |
| 1986 | .49 | 1.29 % |
| 1987 | .55 | 11.99 % |
| 1988 | .59 | 7.12 % |
| 1989 | .66 | 11.67 % |
| 1990 | .68 | 2.84 % |
| 1991 | .68 | -0.21 % |
| 1992 | .72 | 6.10 % |
| 1993 | .74 | 3.03 % |
| 1994 | .84 | 13.94 % |
| 1995 | .90 | 7.33 % |
| 1996 | .96 | 6.17 % |
| 1997 | 1.02 | 5.83 % |
| 1998 | 1.04 | 2.53 % |
| 1999 | 1.11 | 6.69 % |
| 2000 | 1.14 | 2.49 % |
| 2001 | 1.13 | -1.19 % |
| 2002 | 1.15 | 1.90 % |
| 2003 | 1.18 | 3.25 % |
| 2004 | 1.21 | 2.47 % |
| 2005 | 1.22 | 0.16 % |
| 2006 | 1.21 | -0.82 % |
| 2007 | 1.18 | -2.19 % |
| 2008 | 1.20 | 1.99 % |
| 2009 | 1.14 | -4.96 % |
| 2010 | 1.22 | 6.47 % |
|
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