|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 21.57 | NA |
| 1987 | 21.21 | -1.65 % |
| 1988 | 22.91 | 8.01 % |
| 1989 | 21.11 | -7.84 % |
| 1990 | 23.72 | 12.33 % |
| 1991 | 24.73 | 4.26 % |
| 1992 | 21.64 | -12.47 % |
| 1993 | 16.07 | -25.73 % |
| 1994 | 15.44 | -3.92 % |
| 1995 | 15.96 | 3.37 % |
| 1996 | 16.48 | 3.24 % |
| 1997 | 17.17 | 4.16 % |
| 1998 | 17.98 | 4.72 % |
| 1999 | 13.47 | -25.08 % |
| 2000 | 10.82 | -19.65 % |
| 2001 | 10.51 | -2.86 % |
| 2002 | 12.75 | 21.32 % |
| 2003 | 11.13 | -12.70 % |
| 2004 | 19.57 | 75.77 % |
| 2005 | 21.84 | 11.60 % |
| 2006 | 23.00 | 5.34 % |
| 2007 | 27.04 | 17.55 % |
| 2008 | 27.77 | 2.70 % |
| 2009 | 31.82 | 14.59 % |
| 2010 | 29.34 | -7.80 % |
|
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