|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 2.65 | NA |
| 1987 | 6.25 | 135.84 % |
| 1988 | 6.12 | -2.04 % |
| 1989 | 6.40 | 4.50 % |
| 1990 | 5.76 | -10.04 % |
| 1991 | 5.75 | -0.03 % |
| 1992 | 5.92 | 2.92 % |
| 1993 | 6.07 | 2.46 % |
| 1994 | 6.24 | 2.84 % |
| 1995 | 5.69 | -8.78 % |
| 1996 | 5.68 | -0.27 % |
| 1997 | 7.72 | 36.03 % |
| 1998 | 7.14 | -7.58 % |
| 1999 | 8.07 | 13.06 % |
| 2000 | 7.33 | -9.08 % |
| 2001 | 7.96 | 8.53 % |
| 2002 | 7.21 | -9.43 % |
| 2003 | 7.89 | 9.43 % |
| 2004 | 8.58 | 8.77 % |
| 2005 | 9.04 | 5.36 % |
| 2006 | 9.16 | 1.35 % |
| 2007 | 8.63 | -5.86 % |
| 2008 | 7.23 | -16.24 % |
| 2009 | 10.04 | 38.90 % |
| 2010 | 10.48 | 4.45 % |
|
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