|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 8.22 | NA |
| 1987 | 9.40 | 14.44 % |
| 1988 | 9.45 | 0.53 % |
| 1989 | 9.71 | 2.72 % |
| 1990 | 10.41 | 7.21 % |
| 1991 | 12.76 | 22.58 % |
| 1992 | 9.99 | -21.72 % |
| 1993 | 12.08 | 20.94 % |
| 1994 | 12.06 | -0.17 % |
| 1995 | 14.31 | 18.64 % |
| 1996 | 15.29 | 6.85 % |
| 1997 | 15.12 | -1.06 % |
| 1998 | 15.33 | 1.35 % |
| 1999 | 15.35 | 0.13 % |
| 2000 | 13.11 | -14.61 % |
| 2001 | 12.04 | -8.15 % |
| 2002 | 11.38 | -5.43 % |
| 2003 | 10.30 | -9.52 % |
| 2004 | 6.50 | -36.88 % |
| 2005 | 8.93 | 37.37 % |
| 2006 | 8.62 | -3.43 % |
| 2007 | 8.32 | -3.55 % |
| 2008 | 7.93 | -4.67 % |
| 2009 | 7.85 | -1.03 % |
| 2010 | 8.34 | 6.25 % |
|
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