|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.07 | NA |
| 1987 | 3.49 | 13.84 % |
| 1988 | 3.60 | 2.93 % |
| 1989 | 3.70 | 2.82 % |
| 1990 | 3.94 | 6.59 % |
| 1991 | 4.12 | 4.41 % |
| 1992 | 5.04 | 22.33 % |
| 1993 | 4.79 | -4.95 % |
| 1994 | 6.05 | 26.44 % |
| 1995 | 6.99 | 15.48 % |
| 1996 | 7.00 | 0.21 % |
| 1997 | 7.12 | 1.63 % |
| 1998 | 7.98 | 12.20 % |
| 1999 | 8.24 | 3.16 % |
| 2000 | 9.08 | 10.22 % |
| 2001 | 8.85 | -2.55 % |
| 2002 | 9.39 | 6.12 % |
| 2003 | 9.55 | 1.70 % |
| 2004 | 9.27 | -2.89 % |
| 2005 | 9.47 | 2.10 % |
| 2006 | 10.04 | 6.02 % |
| 2007 | 10.61 | 5.75 % |
| 2008 | 11.28 | 6.26 % |
| 2009 | 10.75 | -4.70 % |
| 2010 | 9.85 | -8.32 % |
|
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