|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 84.10 | NA |
| 1987 | 83.74 | -0.42 % |
| 1988 | 83.71 | -0.04 % |
| 1989 | 74.09 | -11.49 % |
| 1990 | 81.96 | 10.62 % |
| 1991 | 63.52 | -22.50 % |
| 1992 | 68.19 | 7.35 % |
| 1993 | 58.43 | -14.31 % |
| 1994 | 53.42 | -8.58 % |
| 1995 | 57.82 | 8.23 % |
| 1996 | 71.39 | 23.48 % |
| 1997 | 62.02 | -13.13 % |
| 1998 | 56.50 | -8.90 % |
| 1999 | 49.75 | -11.95 % |
| 2000 | 58.93 | 18.45 % |
| 2001 | 64.56 | 9.55 % |
| 2002 | 57.41 | -11.08 % |
| 2003 | 68.15 | 18.71 % |
| 2004 | 62.51 | -8.28 % |
| 2005 | 59.83 | -4.28 % |
| 2006 | 62.32 | 4.15 % |
| 2007 | 78.75 | 26.37 % |
| 2008 | 93.34 | 18.53 % |
| 2009 | 84.48 | -9.49 % |
| 2010 | 84.25 | -0.28 % |
|
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