|
| year | consumption | change |
| 1980 | 6.12 | NA |
| 1981 | 6.00 | -1.90 % |
| 1982 | 5.86 | -2.36 % |
| 1983 | 5.75 | -1.85 % |
| 1984 | 6.01 | 4.51 % |
| 1985 | 6.03 | 0.28 % |
| 1986 | 6.11 | 1.33 % |
| 1987 | 6.33 | 3.65 % |
| 1988 | 6.49 | 2.45 % |
| 1989 | 6.68 | 2.92 % |
| 1990 | 6.72 | 0.72 % |
| 1991 | 6.88 | 2.25 % |
| 1992 | 6.84 | -0.54 % |
| 1993 | 6.83 | -0.17 % |
| 1994 | 6.73 | -1.37 % |
| 1995 | 7.04 | 4.63 % |
| 1996 | 7.07 | 0.40 % |
| 1997 | 7.18 | 1.48 % |
| 1998 | 7.38 | 2.85 % |
| 1999 | 7.51 | 1.71 % |
| 2000 | 7.58 | 0.99 % |
| 2001 | 7.62 | 0.54 % |
| 2002 | 7.65 | 0.40 % |
| 2003 | 7.90 | 3.29 % |
| 2004 | 8.17 | 3.31 % |
| 2005 | 8.08 | -1.07 % |
| 2006 | 8.01 | -0.86 % |
| 2007 | 8.04 | 0.37 % |
| 2008 | 7.84 | -2.50 % |
| 2009 | 7.35 | -6.22 % |
| 2010 | 7.63 | 3.73 % |
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