|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.24 | NA |
| 1987 | 3.55 | 9.78 % |
| 1988 | 4.11 | 15.76 % |
| 1989 | 3.85 | -6.38 % |
| 1990 | 4.09 | 6.24 % |
| 1991 | 4.22 | 3.14 % |
| 1992 | 4.94 | 17.13 % |
| 1993 | 5.28 | 6.89 % |
| 1994 | 6.85 | 29.65 % |
| 1995 | 5.84 | -14.69 % |
| 1996 | 6.80 | 16.41 % |
| 1997 | 6.53 | -3.96 % |
| 1998 | 7.97 | 22.02 % |
| 1999 | 8.41 | 5.57 % |
| 2000 | 8.22 | -2.26 % |
| 2001 | 8.37 | 1.77 % |
| 2002 | 7.83 | -6.45 % |
| 2003 | 9.70 | 23.88 % |
| 2004 | 10.25 | 5.73 % |
| 2005 | 10.40 | 1.41 % |
| 2006 | 9.58 | -7.87 % |
| 2007 | 10.00 | 4.39 % |
| 2008 | 9.70 | -3.04 % |
| 2009 | 10.28 | 6.02 % |
| 2010 | 10.05 | -2.27 % |
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