|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 22.87 | NA |
| 1987 | 19.00 | -16.94 % |
| 1988 | 19.19 | 1.02 % |
| 1989 | 18.99 | -1.03 % |
| 1990 | 21.32 | 12.27 % |
| 1991 | 26.29 | 23.30 % |
| 1992 | 27.36 | 4.07 % |
| 1993 | 11.80 | -56.88 % |
| 1994 | 25.09 | 112.62 % |
| 1995 | 26.94 | 7.39 % |
| 1996 | 28.16 | 4.53 % |
| 1997 | 24.83 | -11.84 % |
| 1998 | 29.24 | 17.77 % |
| 1999 | 21.39 | -26.85 % |
| 2000 | 20.96 | -1.99 % |
| 2001 | 23.77 | 13.38 % |
| 2002 | 32.71 | 37.64 % |
| 2003 | 23.84 | -27.12 % |
| 2004 | 25.50 | 6.95 % |
| 2005 | 28.48 | 11.70 % |
| 2006 | 28.05 | -1.51 % |
| 2007 | 24.01 | -14.40 % |
| 2008 | 38.12 | 58.74 % |
| 2009 | 45.54 | 19.48 % |
| 2010 | 40.09 | -11.98 % |
|
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