|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.03 | NA |
| 1987 | 3.02 | -0.40 % |
| 1988 | 2.93 | -3.14 % |
| 1989 | 3.05 | 4.32 % |
| 1990 | 3.02 | -1.05 % |
| 1991 | 1.60 | -46.98 % |
| 1992 | 3.50 | 118.41 % |
| 1993 | 5.60 | 60.11 % |
| 1994 | 4.86 | -13.19 % |
| 1995 | 5.53 | 13.73 % |
| 1996 | 6.66 | 20.36 % |
| 1997 | 4.48 | -32.67 % |
| 1998 | 4.39 | -2.13 % |
| 1999 | 4.30 | -2.03 % |
| 2000 | 5.23 | 21.71 % |
| 2001 | 5.02 | -3.98 % |
| 2002 | 4.93 | -1.90 % |
| 2003 | 6.52 | 32.26 % |
| 2004 | 6.97 | 7.02 % |
| 2005 | 5.28 | -24.34 % |
| 2006 | 5.12 | -3.01 % |
| 2007 | 3.31 | -35.40 % |
| 2008 | 5.18 | 56.73 % |
| 2009 | 6.32 | 22.09 % |
| 2010 | 5.21 | -17.59 % |
|
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