|
| year | consumption | change |
| 1984 | 423.08 | NA |
| 1985 | 416.85 | -1.47 % |
| 1986 | 427.92 | 2.65 % |
| 1987 | 429.14 | 0.29 % |
| 1988 | 434.71 | 1.30 % |
| 1989 | 428.05 | -1.53 % |
| 1990 | 422.06 | -1.40 % |
| 1991 | 415.14 | -1.64 % |
| 1992 | 407.31 | -1.89 % |
| 1993 | 395.81 | -2.82 % |
| 1994 | 382.36 | -3.40 % |
| 1995 | 362.88 | -5.09 % |
| 1996 | 346.66 | -4.47 % |
| 1997 | 339.13 | -2.17 % |
| 1998 | 337.10 | -0.60 % |
| 1999 | 334.90 | -0.65 % |
| 2000 | 318.40 | -4.93 % |
| 2001 | 310.17 | -2.58 % |
| 2002 | 299.41 | -3.47 % |
| 2003 | 280.54 | -6.30 % |
| 2004 | 266.13 | -5.14 % |
| 2005 | 250.74 | -5.78 % |
| 2006 | 236.14 | -5.82 % |
| 2007 | 225.47 | -4.52 % |
| 2008 | 206.10 | -8.59 % |
| 2009 | 198.75 | -3.57 % |
| 2010 | 186.43 | -6.20 % |
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