|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 3.79 | NA |
| 1987 | 3.89 | 2.70 % |
| 1988 | 3.96 | 1.81 % |
| 1989 | 7.20 | 81.59 % |
| 1990 | 5.40 | -25.05 % |
| 1991 | 5.00 | -7.36 % |
| 1992 | 5.10 | 2.05 % |
| 1993 | 4.57 | -10.52 % |
| 1994 | 4.52 | -0.98 % |
| 1995 | 4.11 | -9.04 % |
| 1996 | 6.89 | 67.52 % |
| 1997 | 7.30 | 5.92 % |
| 1998 | 5.64 | -22.64 % |
| 1999 | 5.75 | 1.80 % |
| 2000 | 6.52 | 13.53 % |
| 2001 | 6.01 | -7.87 % |
| 2002 | 7.10 | 18.13 % |
| 2003 | 6.69 | -5.75 % |
| 2004 | 7.57 | 13.21 % |
| 2005 | 7.66 | 1.19 % |
| 2006 | 7.21 | -5.87 % |
| 2007 | 7.01 | -2.83 % |
| 2008 | 7.01 | 0.00 % |
| 2009 | 6.99 | -0.29 % |
| 2010 | 6.99 | 0.00 % |
|
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