|
| year | consumption | change |
| 1980 | 8.84 | NA |
| 1981 | 8.52 | -3.67 % |
| 1982 | 8.37 | -1.70 % |
| 1983 | 8.41 | 0.41 % |
| 1984 | 8.45 | 0.53 % |
| 1985 | 8.73 | 3.36 % |
| 1986 | 8.90 | 1.90 % |
| 1987 | 9.05 | 1.67 % |
| 1988 | 9.05 | 0.04 % |
| 1989 | 9.29 | 2.66 % |
| 1990 | 9.27 | -0.24 % |
| 1991 | 9.52 | 2.69 % |
| 1992 | 9.27 | -2.59 % |
| 1993 | 9.57 | 3.20 % |
| 1994 | 9.53 | -0.37 % |
| 1995 | 9.45 | -0.84 % |
| 1996 | 10.05 | 6.29 % |
| 1997 | 9.75 | -2.92 % |
| 1998 | 9.74 | -0.14 % |
| 1999 | 9.79 | 0.53 % |
| 2000 | 9.73 | -0.65 % |
| 2001 | 9.88 | 1.56 % |
| 2002 | 9.93 | 0.53 % |
| 2003 | 9.98 | 0.45 % |
| 2004 | 10.03 | 0.49 % |
| 2005 | 9.84 | -1.83 % |
| 2006 | 9.73 | -1.18 % |
| 2007 | 9.56 | -1.72 % |
| 2008 | 9.29 | -2.87 % |
| 2009 | 8.78 | -5.40 % |
| 2010 | 8.91 | 1.47 % |
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