|
| year | consumption | change |
| 1984 | 467.02 | NA |
| 1985 | 472.34 | 1.14 % |
| 1986 | 497.05 | 5.23 % |
| 1987 | 513.58 | 3.33 % |
| 1988 | 536.76 | 4.51 % |
| 1989 | 553.86 | 3.19 % |
| 1990 | 562.84 | 1.62 % |
| 1991 | 556.10 | -1.20 % |
| 1992 | 555.11 | -0.18 % |
| 1993 | 550.19 | -0.89 % |
| 1994 | 528.83 | -3.88 % |
| 1995 | 508.23 | -3.90 % |
| 1996 | 517.42 | 1.81 % |
| 1997 | 515.15 | -0.44 % |
| 1998 | 505.80 | -1.82 % |
| 1999 | 523.13 | 3.43 % |
| 2000 | 498.76 | -4.66 % |
| 2001 | 484.61 | -2.84 % |
| 2002 | 481.72 | -0.60 % |
| 2003 | 461.12 | -4.28 % |
| 2004 | 449.84 | -2.45 % |
| 2005 | 435.19 | -3.26 % |
| 2006 | 421.78 | -3.08 % |
| 2007 | 410.05 | -2.78 % |
| 2008 | 388.47 | -5.26 % |
| 2009 | 370.69 | -4.58 % |
| 2010 | 352.93 | -4.79 % |
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