|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 8.56 | NA |
| 1987 | 7.26 | -15.17 % |
| 1988 | 9.40 | 29.43 % |
| 1989 | 14.00 | 48.94 % |
| 1990 | 17.00 | 21.42 % |
| 1991 | 22.66 | 33.29 % |
| 1992 | 11.17 | -50.69 % |
| 1993 | 10.48 | -6.19 % |
| 1994 | 12.10 | 15.50 % |
| 1995 | 9.51 | -21.43 % |
| 1996 | 8.75 | -7.97 % |
| 1997 | 6.57 | -24.91 % |
| 1998 | 10.72 | 63.15 % |
| 1999 | 9.38 | -12.50 % |
| 2000 | 9.04 | -3.62 % |
| 2001 | 8.54 | -5.51 % |
| 2002 | 9.16 | 7.23 % |
| 2003 | 8.71 | -4.91 % |
| 2004 | 10.35 | 18.84 % |
| 2005 | 10.04 | -3.03 % |
| 2006 | 9.85 | -1.91 % |
| 2007 | 5.42 | -44.97 % |
| 2008 | 5.02 | -7.41 % |
| 2009 | 10.55 | 110.30 % |
| 2010 | 12.23 | 15.93 % |
|
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