|
| year | consumption | change |
| 1984 | 575.09 | NA |
| 1985 | 569.46 | -0.98 % |
| 1986 | 580.18 | 1.88 % |
| 1987 | 592.97 | 2.20 % |
| 1988 | 539.31 | -9.05 % |
| 1989 | 578.67 | 7.30 % |
| 1990 | 600.18 | 3.72 % |
| 1991 | 603.03 | 0.48 % |
| 1992 | 617.57 | 2.41 % |
| 1993 | 636.05 | 2.99 % |
| 1994 | 610.04 | -4.09 % |
| 1995 | 631.18 | 3.46 % |
| 1996 | 641.67 | 1.66 % |
| 1997 | 632.04 | -1.50 % |
| 1998 | 616.27 | -2.50 % |
| 1999 | 636.49 | 3.28 % |
| 2000 | 607.55 | -4.55 % |
| 2001 | 607.63 | 0.01 % |
| 2002 | 597.46 | -1.67 % |
| 2003 | 572.91 | -4.11 % |
| 2004 | 542.16 | -5.37 % |
| 2005 | 535.99 | -1.14 % |
| 2006 | 562.07 | 4.86 % |
| 2007 | 543.79 | -3.25 % |
| 2008 | 533.05 | -1.97 % |
| 2009 | 510.15 | -4.30 % |
| 2010 | 492.37 | -3.48 % |
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