|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 19.59 | NA |
| 1993 | 9.93 | -49.31 % |
| 1994 | 11.01 | 10.85 % |
| 1995 | 11.45 | 4.07 % |
| 1996 | 10.16 | -11.30 % |
| 1997 | 10.35 | 1.85 % |
| 1998 | 10.26 | -0.87 % |
| 1999 | 8.83 | -13.96 % |
| 2000 | 9.19 | 4.07 % |
| 2001 | 8.46 | -7.94 % |
| 2002 | 7.55 | -10.68 % |
| 2003 | 7.76 | 2.79 % |
| 2004 | 9.65 | 24.30 % |
| 2005 | 7.67 | -20.53 % |
| 2006 | 8.14 | 6.13 % |
| 2007 | 8.17 | 0.35 % |
| 2008 | 8.58 | 5.06 % |
| 2009 | 8.04 | -6.25 % |
| 2010 | 7.55 | -6.11 % |
|
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