|
| year | consumption | change |
| 1984 | 4.91 | NA |
| 1985 | 5.08 | 3.62 % |
| 1986 | 5.18 | 1.78 % |
| 1987 | 6.52 | 25.94 % |
| 1988 | 5.26 | -19.30 % |
| 1989 | 4.70 | -10.66 % |
| 1990 | 4.80 | 2.10 % |
| 1991 | 4.23 | -11.88 % |
| 1992 | 4.18 | -1.05 % |
| 1993 | 4.10 | -1.89 % |
| 1994 | 4.83 | 17.62 % |
| 1995 | 4.92 | 1.93 % |
| 1996 | 5.26 | 6.89 % |
| 1997 | 5.98 | 13.77 % |
| 1998 | 6.47 | 8.15 % |
| 1999 | 5.56 | -14.14 % |
| 2000 | 6.47 | 16.40 % |
| 2001 | 6.73 | 4.13 % |
| 2002 | 9.31 | 38.28 % |
| 2003 | 9.85 | 5.74 % |
| 2004 | 10.54 | 7.08 % |
| 2005 | 11.12 | 5.47 % |
| 2006 | 10.89 | -2.04 % |
| 2007 | 11.28 | 3.52 % |
| 2008 | 11.66 | 3.36 % |
| 2009 | 10.01 | -14.16 % |
| 2010 | 11.89 | 18.87 % |
|
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