|
| year | consumption | change |
| 1980 | 522.00 | NA |
| 1981 | 481.00 | -7.85 % |
| 1982 | 445.00 | -7.48 % |
| 1983 | 406.74 | -8.60 % |
| 1984 | 385.00 | -5.34 % |
| 1985 | 405.00 | 5.19 % |
| 1986 | 454.00 | 12.10 % |
| 1987 | 457.00 | 0.66 % |
| 1988 | 470.00 | 2.84 % |
| 1989 | 462.00 | -1.70 % |
| 1990 | 463.00 | 0.22 % |
| 1991 | 497.00 | 7.34 % |
| 1992 | 509.00 | 2.41 % |
| 1993 | 500.00 | -1.77 % |
| 1994 | 553.00 | 10.60 % |
| 1995 | 550.00 | -0.54 % |
| 1996 | 593.00 | 7.82 % |
| 1997 | 611.00 | 3.04 % |
| 1998 | 622.00 | 1.80 % |
| 1999 | 593.00 | -4.66 % |
| 2000 | 606.32 | 2.25 % |
| 2001 | 609.07 | 0.45 % |
| 2002 | 617.27 | 1.35 % |
| 2003 | 654.55 | 6.04 % |
| 2004 | 656.54 | 0.30 % |
| 2005 | 659.81 | 0.50 % |
| 2006 | 638.23 | -3.27 % |
| 2007 | 640.38 | 0.34 % |
| 2008 | 716.61 | 11.91 % |
| 2009 | 630.20 | -12.06 % |
| 2010 | 644.93 | 2.34 % |
| 2011 | 644.44 | -0.08 % |
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