|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 11.23 | NA |
| 1993 | 11.78 | 4.85 % |
| 1994 | 9.07 | -23.02 % |
| 1995 | 9.35 | 3.09 % |
| 1996 | 10.25 | 9.70 % |
| 1997 | 10.35 | 0.96 % |
| 1998 | 12.39 | 19.64 % |
| 1999 | 11.08 | -10.57 % |
| 2000 | 11.14 | 0.57 % |
| 2001 | 17.99 | 61.53 % |
| 2002 | 17.53 | -2.60 % |
| 2003 | 18.37 | 4.80 % |
| 2004 | 17.01 | -7.38 % |
| 2005 | 17.71 | 4.12 % |
| 2006 | 21.10 | 19.13 % |
| 2007 | 26.76 | 26.80 % |
| 2008 | 21.43 | -19.91 % |
| 2009 | 19.07 | -11.01 % |
| 2010 | 18.53 | -2.82 % |
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