|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.60 | NA |
| 1987 | 5.35 | 16.37 % |
| 1988 | 5.16 | -3.67 % |
| 1989 | 5.84 | 13.33 % |
| 1990 | 6.80 | 16.41 % |
| 1991 | 6.31 | -7.23 % |
| 1992 | 6.76 | 7.13 % |
| 1993 | 6.61 | -2.15 % |
| 1994 | 6.89 | 4.24 % |
| 1995 | 7.01 | 1.69 % |
| 1996 | 8.16 | 16.35 % |
| 1997 | 10.63 | 30.36 % |
| 1998 | 9.82 | -7.69 % |
| 1999 | 9.82 | 0.00 % |
| 2000 | 8.16 | -16.89 % |
| 2001 | 7.48 | -8.32 % |
| 2002 | 7.08 | -5.31 % |
| 2003 | 6.40 | -9.57 % |
| 2004 | 5.03 | -21.38 % |
| 2005 | 4.02 | -20.15 % |
| 2006 | 3.83 | -4.65 % |
| 2007 | 3.60 | -6.10 % |
| 2008 | 3.39 | -5.84 % |
| 2009 | 3.34 | -1.38 % |
| 2010 | 3.65 | 9.09 % |
|
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