|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 8.18 | NA |
| 1987 | 7.71 | -5.71 % |
| 1988 | 10.38 | 34.64 % |
| 1989 | 10.22 | -1.59 % |
| 1990 | 8.52 | -16.57 % |
| 1991 | 6.00 | -29.57 % |
| 1992 | 6.41 | 6.72 % |
| 1993 | 7.56 | 17.94 % |
| 1994 | 8.34 | 10.37 % |
| 1995 | 8.25 | -1.13 % |
| 1996 | 7.15 | -13.25 % |
| 1997 | 3.33 | -53.45 % |
| 1998 | 2.22 | -33.41 % |
| 1999 | 3.60 | 62.21 % |
| 2000 | 6.70 | 86.38 % |
| 2001 | 4.61 | -31.15 % |
| 2002 | 3.93 | -14.84 % |
| 2003 | 3.69 | -6.21 % |
| 2004 | 4.15 | 12.72 % |
| 2005 | 2.70 | -34.91 % |
| 2006 | 2.38 | -11.97 % |
| 2007 | 1.55 | -34.85 % |
| 2008 | 1.61 | 3.53 % |
| 2009 | 1.80 | 12.15 % |
| 2010 | 1.93 | 7.28 % |
|
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