|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 108.14 | NA |
| 1987 | 107.90 | -0.22 % |
| 1988 | 99.80 | -7.51 % |
| 1989 | 99.11 | -0.69 % |
| 1990 | 91.21 | -7.97 % |
| 1991 | 102.30 | 12.16 % |
| 1992 | 109.08 | 6.63 % |
| 1993 | 123.51 | 13.23 % |
| 1994 | 124.90 | 1.13 % |
| 1995 | 120.44 | -3.57 % |
| 1996 | 127.77 | 6.09 % |
| 1997 | 102.73 | -19.60 % |
| 1998 | 94.30 | -8.21 % |
| 1999 | 86.75 | -8.00 % |
| 2000 | 96.85 | 11.64 % |
| 2001 | 82.07 | -15.26 % |
| 2002 | 62.09 | -24.34 % |
| 2003 | 84.95 | 36.80 % |
| 2004 | 46.68 | -45.05 % |
| 2005 | 70.46 | 50.94 % |
| 2006 | 81.75 | 16.02 % |
| 2007 | 89.60 | 9.61 % |
| 2008 | 92.57 | 3.31 % |
| 2009 | 98.76 | 6.69 % |
| 2010 | 95.28 | -3.53 % |
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