|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.93 | NA |
| 1987 | 4.87 | -1.11 % |
| 1988 | 4.73 | -2.89 % |
| 1989 | 4.93 | 4.13 % |
| 1990 | 5.02 | 1.85 % |
| 1991 | 4.98 | -0.73 % |
| 1992 | 4.95 | -0.64 % |
| 1993 | 4.93 | -0.46 % |
| 1994 | 4.84 | -1.85 % |
| 1995 | 4.85 | 0.29 % |
| 1996 | 4.84 | -0.27 % |
| 1997 | 4.90 | 1.42 % |
| 1998 | 4.76 | -3.00 % |
| 1999 | 4.76 | 0.00 % |
| 2000 | 4.78 | 0.50 % |
| 2001 | 4.79 | 0.27 % |
| 2002 | 6.19 | 29.09 % |
| 2003 | 7.92 | 28.04 % |
| 2004 | 8.29 | 4.64 % |
| 2005 | 8.70 | 4.90 % |
| 2006 | 5.25 | -39.61 % |
| 2007 | 5.04 | -4.14 % |
| 2008 | 6.16 | 22.23 % |
| 2009 | 5.89 | -4.24 % |
| 2010 | 5.91 | 0.31 % |
|
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