|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 8.57 | NA |
| 1993 | 8.09 | -5.67 % |
| 1994 | 7.00 | -13.40 % |
| 1995 | 6.91 | -1.29 % |
| 1996 | 6.34 | -8.34 % |
| 1997 | 6.07 | -4.23 % |
| 1998 | 5.85 | -3.59 % |
| 1999 | 5.75 | -1.66 % |
| 2000 | 5.75 | -0.05 % |
| 2001 | 5.64 | -1.91 % |
| 2002 | 5.82 | 3.20 % |
| 2003 | 6.28 | 7.92 % |
| 2004 | 6.25 | -0.45 % |
| 2005 | 6.33 | 1.14 % |
| 2006 | 5.87 | -7.23 % |
| 2007 | 6.30 | 7.35 % |
| 2008 | 6.22 | -1.19 % |
| 2009 | 4.46 | -28.38 % |
| 2010 | 5.09 | 14.25 % |
|
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