|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.87 | NA |
| 1987 | 2.69 | -6.50 % |
| 1988 | 2.65 | -1.48 % |
| 1989 | 3.16 | 19.50 % |
| 1990 | 3.12 | -1.25 % |
| 1991 | 3.21 | 2.78 % |
| 1992 | 3.57 | 11.04 % |
| 1993 | 4.40 | 23.27 % |
| 1994 | 5.07 | 15.37 % |
| 1995 | 4.65 | -8.27 % |
| 1996 | 5.91 | 27.04 % |
| 1997 | 5.92 | 0.19 % |
| 1998 | 6.68 | 12.76 % |
| 1999 | 7.10 | 6.41 % |
| 2000 | 7.11 | 0.05 % |
| 2001 | 7.60 | 6.96 % |
| 2002 | 7.60 | -0.11 % |
| 2003 | 7.45 | -1.85 % |
| 2004 | 7.02 | -5.90 % |
| 2005 | 7.08 | 0.94 % |
| 2006 | 7.90 | 11.55 % |
| 2007 | 9.53 | 20.71 % |
| 2008 | 9.39 | -1.47 % |
| 2009 | 10.68 | 13.68 % |
| 2010 | 11.12 | 4.16 % |
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