|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.08 | NA |
| 1987 | 3.15 | 51.75 % |
| 1988 | 2.44 | -22.48 % |
| 1989 | 2.83 | 15.78 % |
| 1990 | 2.65 | -6.42 % |
| 1991 | 2.10 | -20.70 % |
| 1992 | 2.46 | 17.05 % |
| 1993 | 2.52 | 2.68 % |
| 1994 | 2.62 | 3.70 % |
| 1995 | 2.57 | -1.79 % |
| 1996 | 2.61 | 1.54 % |
| 1997 | 2.64 | 1.17 % |
| 1998 | 2.66 | 0.88 % |
| 1999 | 2.76 | 3.51 % |
| 2000 | 2.84 | 3.11 % |
| 2001 | 3.34 | 17.53 % |
| 2002 | 3.83 | 14.69 % |
| 2003 | 4.11 | 7.32 % |
| 2004 | 4.40 | 7.09 % |
| 2005 | 4.72 | 7.17 % |
| 2006 | 5.00 | 5.94 % |
| 2007 | 5.35 | 7.01 % |
| 2008 | 5.80 | 8.30 % |
| 2009 | 6.12 | 5.65 % |
| 2010 | 5.73 | -6.49 % |
|
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