|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.60 | NA |
| 1987 | 4.50 | -2.22 % |
| 1988 | 4.55 | 1.09 % |
| 1989 | 4.50 | -1.08 % |
| 1990 | 4.36 | -3.18 % |
| 1991 | 4.16 | -4.44 % |
| 1992 | 4.67 | 12.21 % |
| 1993 | 4.65 | -0.49 % |
| 1994 | 5.29 | 13.89 % |
| 1995 | 6.20 | 17.13 % |
| 1996 | 5.96 | -3.93 % |
| 1997 | 7.59 | 27.41 % |
| 1998 | 8.47 | 11.63 % |
| 1999 | 8.24 | -2.73 % |
| 2000 | 7.81 | -5.22 % |
| 2001 | 7.86 | 0.61 % |
| 2002 | 7.24 | -7.88 % |
| 2003 | 6.79 | -6.21 % |
| 2004 | 8.10 | 19.24 % |
| 2005 | 8.65 | 6.84 % |
| 2006 | 8.39 | -2.93 % |
| 2007 | 9.54 | 13.70 % |
| 2008 | 8.44 | -11.56 % |
| 2009 | 8.53 | 1.01 % |
| 2010 | 7.99 | -6.23 % |
|
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