|
| year | consumption | change |
| 1984 | 5.96 | NA |
| 1985 | 5.95 | -0.23 % |
| 1986 | 4.87 | -18.19 % |
| 1987 | 4.86 | -0.23 % |
| 1988 | 5.61 | 15.48 % |
| 1989 | 4.91 | -12.52 % |
| 1990 | 6.41 | 30.71 % |
| 1991 | 5.40 | -15.81 % |
| 1992 | 7.39 | 36.87 % |
| 1993 | 6.05 | -18.19 % |
| 1994 | 7.90 | 30.63 % |
| 1995 | 7.06 | -10.65 % |
| 1996 | 7.19 | 1.93 % |
| 1997 | 6.76 | -6.09 % |
| 1998 | 4.69 | -30.58 % |
| 1999 | 4.33 | -7.71 % |
| 2000 | 4.93 | 13.87 % |
| 2001 | 4.69 | -4.78 % |
| 2002 | 5.56 | 18.51 % |
| 2003 | 5.45 | -2.02 % |
| 2004 | 4.77 | -12.56 % |
| 2005 | 5.57 | 16.83 % |
| 2006 | 5.14 | -7.68 % |
| 2007 | 5.56 | 8.21 % |
| 2008 | 6.61 | 18.79 % |
| 2009 | 7.41 | 12.18 % |
| 2010 | 8.28 | 11.79 % |
|
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