|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 35.84 | NA |
| 1987 | 33.02 | -7.84 % |
| 1988 | 33.00 | -0.08 % |
| 1989 | 28.29 | -14.28 % |
| 1990 | 27.70 | -2.07 % |
| 1991 | 23.73 | -14.32 % |
| 1992 | 22.21 | -6.42 % |
| 1993 | 21.09 | -5.05 % |
| 1994 | 29.19 | 38.42 % |
| 1995 | 30.39 | 4.11 % |
| 1996 | 32.77 | 7.81 % |
| 1997 | 33.68 | 2.79 % |
| 1998 | 34.26 | 1.73 % |
| 1999 | 37.82 | 10.38 % |
| 2000 | 41.31 | 9.22 % |
| 2001 | 38.39 | -7.07 % |
| 2002 | 34.87 | -9.16 % |
| 2003 | 30.82 | -11.62 % |
| 2004 | 37.66 | 22.19 % |
| 2005 | 30.77 | -18.27 % |
| 2006 | 33.78 | 9.78 % |
| 2007 | 25.33 | -25.04 % |
| 2008 | 24.98 | -1.37 % |
| 2009 | 24.39 | -2.35 % |
| 2010 | 17.57 | -27.99 % |
|
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