|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 5.02 | NA |
| 1987 | 4.91 | -2.33 % |
| 1988 | | NA |
| 1989 | 5.47 | NA |
| 1990 | 4.74 | -13.38 % |
| 1991 | 6.94 | 46.53 % |
| 1992 | 7.39 | 6.44 % |
| 1993 | 7.81 | 5.65 % |
| 1994 | 7.83 | 0.30 % |
| 1995 | 7.88 | 0.60 % |
| 1996 | 7.84 | -0.45 % |
| 1997 | 8.37 | 6.71 % |
| 1998 | 7.41 | -11.45 % |
| 1999 | 7.55 | 1.89 % |
| 2000 | 12.80 | 69.50 % |
| 2001 | 12.81 | 0.09 % |
| 2002 | 13.74 | 7.30 % |
| 2003 | 13.34 | -2.89 % |
| 2004 | 14.31 | 7.24 % |
| 2005 | 14.75 | 3.05 % |
| 2006 | 12.95 | -12.20 % |
| 2007 | 14.12 | 9.03 % |
| 2008 | 12.48 | -11.59 % |
| 2009 | 14.91 | 19.48 % |
| 2010 | 17.25 | 15.67 % |
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