|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 9.30 | NA |
| 1987 | 10.51 | 13.04 % |
| 1988 | 9.35 | -11.04 % |
| 1989 | 8.04 | -14.04 % |
| 1990 | 9.25 | 15.08 % |
| 1991 | 9.25 | -0.02 % |
| 1992 | 9.36 | 1.18 % |
| 1993 | 9.84 | 5.20 % |
| 1994 | 10.85 | 10.17 % |
| 1995 | 10.26 | -5.38 % |
| 1996 | 13.75 | 33.97 % |
| 1997 | 11.61 | -15.58 % |
| 1998 | 13.60 | 17.15 % |
| 1999 | 12.10 | -11.01 % |
| 2000 | 15.06 | 24.42 % |
| 2001 | 15.67 | 4.09 % |
| 2002 | 15.22 | -2.87 % |
| 2003 | 15.39 | 1.08 % |
| 2004 | 14.87 | -3.35 % |
| 2005 | 18.18 | 22.20 % |
| 2006 | 17.84 | -1.85 % |
| 2007 | 18.74 | 5.05 % |
| 2008 | 20.58 | 9.83 % |
| 2009 | 25.41 | 23.47 % |
| 2010 | 20.50 | -19.32 % |
|
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