|
| year | consumption | change |
| 1980 | .97 | NA |
| 1981 | .99 | 1.82 % |
| 1982 | .91 | -8.43 % |
| 1983 | .90 | -0.29 % |
| 1984 | .95 | 4.59 % |
| 1985 | .96 | 1.20 % |
| 1986 | .99 | 3.35 % |
| 1987 | 1.06 | 7.67 % |
| 1988 | 1.06 | -0.38 % |
| 1989 | 1.07 | 0.98 % |
| 1990 | 1.12 | 4.21 % |
| 1991 | 1.13 | 1.56 % |
| 1992 | 1.14 | 0.20 % |
| 1993 | 1.15 | 0.98 % |
| 1994 | 1.19 | 3.39 % |
| 1995 | 1.13 | -4.62 % |
| 1996 | 1.14 | 1.12 % |
| 1997 | 1.18 | 3.09 % |
| 1998 | 1.23 | 3.95 % |
| 1999 | 1.21 | -0.99 % |
| 2000 | 1.22 | 0.28 % |
| 2001 | 1.23 | 0.96 % |
| 2002 | 1.24 | 1.22 % |
| 2003 | 1.32 | 5.94 % |
| 2004 | 1.35 | 2.69 % |
| 2005 | 1.27 | -6.45 % |
| 2006 | 1.33 | 4.76 % |
| 2007 | 1.35 | 1.90 % |
| 2008 | 1.29 | -4.15 % |
| 2009 | 1.21 | -6.79 % |
| 2010 | 1.30 | 7.98 % |
|
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