|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 16.12 | NA |
| 1993 | 18.73 | 16.20 % |
| 1994 | 15.63 | -16.54 % |
| 1995 | 15.75 | 0.78 % |
| 1996 | 14.15 | -10.21 % |
| 1997 | 17.16 | 21.34 % |
| 1998 | 19.74 | 15.02 % |
| 1999 | 14.99 | -24.08 % |
| 2000 | 15.22 | 1.52 % |
| 2001 | 14.39 | -5.40 % |
| 2002 | 14.55 | 1.08 % |
| 2003 | 20.10 | 38.17 % |
| 2004 | 19.37 | -3.66 % |
| 2005 | 20.12 | 3.88 % |
| 2006 | 23.74 | 18.02 % |
| 2007 | 20.27 | -14.62 % |
| 2008 | 21.99 | 8.46 % |
| 2009 | 21.45 | -2.45 % |
| 2010 | 20.83 | -2.88 % |
|
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