|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 6.87 | NA |
| 1987 | 7.20 | 4.80 % |
| 1988 | 7.20 | 0.00 % |
| 1989 | 7.20 | -0.01 % |
| 1990 | | NA |
| 1991 | 8.00 | NA |
| 1992 | 7.32 | -8.54 % |
| 1993 | 5.35 | -26.87 % |
| 1994 | 6.87 | 28.38 % |
| 1995 | 7.25 | 5.52 % |
| 1996 | 6.50 | -10.35 % |
| 1997 | 6.49 | -0.16 % |
| 1998 | 6.46 | -0.46 % |
| 1999 | 5.54 | -14.26 % |
| 2000 | 6.08 | 9.83 % |
| 2001 | 6.50 | 6.81 % |
| 2002 | 5.52 | -15.11 % |
| 2003 | 5.73 | 3.81 % |
| 2004 | 6.60 | 15.19 % |
| 2005 | 6.85 | 3.82 % |
| 2006 | 6.73 | -1.71 % |
| 2007 | 9.02 | 34.03 % |
| 2008 | 8.79 | -2.59 % |
| 2009 | 9.49 | 7.98 % |
| 2010 | 8.02 | -15.52 % |
|
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