|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | 3.31 | NA |
| 1994 | 3.87 | 17.07 % |
| 1995 | 5.82 | 50.32 % |
| 1996 | 6.05 | 3.91 % |
| 1997 | 7.08 | 17.18 % |
| 1998 | 7.44 | 4.99 % |
| 1999 | 7.78 | 4.64 % |
| 2000 | 8.37 | 7.48 % |
| 2001 | 8.71 | 4.11 % |
| 2002 | 7.66 | -12.05 % |
| 2003 | 7.82 | 2.11 % |
| 2004 | 9.01 | 15.13 % |
| 2005 | 8.33 | -7.54 % |
| 2006 | 7.66 | -8.00 % |
| 2007 | 6.77 | -11.66 % |
| 2008 | 6.94 | 2.59 % |
| 2009 | 6.04 | -12.95 % |
| 2010 | 5.91 | -2.18 % |
|
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