|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 4.50 | NA |
| 1987 | 4.60 | 2.27 % |
| 1988 | 4.65 | 1.05 % |
| 1989 | 4.40 | -5.25 % |
| 1990 | 4.63 | 5.09 % |
| 1991 | 4.60 | -0.61 % |
| 1992 | 4.59 | -0.27 % |
| 1993 | 4.50 | -1.95 % |
| 1994 | 4.29 | -4.55 % |
| 1995 | 4.80 | 11.90 % |
| 1996 | 4.69 | -2.40 % |
| 1997 | 4.84 | 3.33 % |
| 1998 | 4.78 | -1.27 % |
| 1999 | 4.78 | 0.00 % |
| 2000 | 4.83 | 1.01 % |
| 2001 | 5.87 | 21.43 % |
| 2002 | 6.07 | 3.48 % |
| 2003 | 7.50 | 23.57 % |
| 2004 | 8.42 | 12.23 % |
| 2005 | 8.50 | 1.00 % |
| 2006 | 9.14 | 7.45 % |
| 2007 | 9.16 | 0.22 % |
| 2008 | 8.93 | -2.46 % |
| 2009 | 10.40 | 16.48 % |
| 2010 | 10.22 | -1.77 % |
|
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