|
| year | consumption | change |
| 1984 | 10.37 | NA |
| 1985 | 10.40 | 0.30 % |
| 1986 | 9.82 | -5.53 % |
| 1987 | 10.01 | 1.92 % |
| 1988 | 9.80 | -2.16 % |
| 1989 | 9.91 | 1.17 % |
| 1990 | 10.56 | 6.52 % |
| 1991 | 9.62 | -8.82 % |
| 1992 | 9.05 | -5.98 % |
| 1993 | 9.05 | 0.00 % |
| 1994 | 8.48 | -6.33 % |
| 1995 | 9.46 | 11.64 % |
| 1996 | 10.74 | 13.50 % |
| 1997 | 10.32 | -3.93 % |
| 1998 | 11.19 | 8.44 % |
| 1999 | 10.52 | -5.95 % |
| 2000 | 10.62 | 0.92 % |
| 2001 | 9.41 | -11.44 % |
| 2002 | 9.79 | 4.08 % |
| 2003 | 9.70 | -0.95 % |
| 2004 | 9.46 | -2.41 % |
| 2005 | 10.81 | 14.26 % |
| 2006 | 10.39 | -3.85 % |
| 2007 | 9.62 | -7.48 % |
| 2008 | 9.48 | -1.44 % |
| 2009 | 9.25 | -2.41 % |
| 2010 | 9.85 | 6.46 % |
|
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