|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 9.40 | NA |
| 1987 | 9.00 | -4.31 % |
| 1988 | 8.90 | -1.06 % |
| 1989 | 13.74 | 54.38 % |
| 1990 | 7.75 | -43.63 % |
| 1991 | 7.10 | -8.33 % |
| 1992 | 6.99 | -1.49 % |
| 1993 | 13.48 | 92.79 % |
| 1994 | 8.54 | -36.70 % |
| 1995 | 9.21 | 7.86 % |
| 1996 | 8.44 | -8.28 % |
| 1997 | 8.24 | -2.43 % |
| 1998 | 9.67 | 17.36 % |
| 1999 | 9.11 | -5.78 % |
| 2000 | 9.23 | 1.27 % |
| 2001 | 10.30 | 11.66 % |
| 2002 | 11.48 | 11.48 % |
| 2003 | 11.26 | -1.93 % |
| 2004 | 12.71 | 12.86 % |
| 2005 | 17.42 | 37.07 % |
| 2006 | 20.35 | 16.83 % |
| 2007 | 23.10 | 13.51 % |
| 2008 | 17.80 | -22.97 % |
| 2009 | 20.45 | 14.91 % |
| 2010 | 15.12 | -26.08 % |
|
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