|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 29.00 | NA |
| 1987 | 27.60 | -4.83 % |
| 1988 | 29.00 | 5.07 % |
| 1989 | 27.70 | -4.48 % |
| 1990 | 31.00 | 11.91 % |
| 1991 | 11.86 | -61.74 % |
| 1992 | 16.37 | 38.01 % |
| 1993 | 23.30 | 42.32 % |
| 1994 | 25.84 | 10.91 % |
| 1995 | 23.51 | -9.02 % |
| 1996 | 23.55 | 0.18 % |
| 1997 | 20.61 | -12.50 % |
| 1998 | 21.39 | 3.80 % |
| 1999 | 20.33 | -4.95 % |
| 2000 | 21.23 | 4.40 % |
| 2001 | 23.55 | 10.95 % |
| 2002 | 24.04 | 2.07 % |
| 2003 | 20.12 | -16.30 % |
| 2004 | 26.42 | 31.32 % |
| 2005 | 27.02 | 2.28 % |
| 2006 | 28.36 | 4.94 % |
| 2007 | 39.48 | 39.21 % |
| 2008 | 30.69 | -22.26 % |
| 2009 | 32.59 | 6.21 % |
| 2010 | 31.53 | -3.25 % |
|
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