|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | | NA |
| 1993 | 17.15 | NA |
| 1994 | 16.97 | -1.07 % |
| 1995 | 18.61 | 9.70 % |
| 1996 | 17.52 | -5.85 % |
| 1997 | 17.84 | 1.82 % |
| 1998 | 18.13 | 1.60 % |
| 1999 | 17.70 | -2.37 % |
| 2000 | 17.15 | -3.11 % |
| 2001 | 18.12 | 5.66 % |
| 2002 | 21.36 | 17.90 % |
| 2003 | 18.80 | -11.98 % |
| 2004 | 19.95 | 6.12 % |
| 2005 | 22.77 | 14.11 % |
| 2006 | 24.26 | 6.55 % |
| 2007 | 27.49 | 13.31 % |
| 2008 | 29.67 | 7.95 % |
| 2009 | 26.30 | -11.38 % |
| 2010 | 32.54 | 23.72 % |
|
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