|
| year | consumption | change |
| 1984 | 87.10 | NA |
| 1985 | 94.86 | 8.91 % |
| 1986 | 92.79 | -2.18 % |
| 1987 | 86.38 | -6.91 % |
| 1988 | 65.02 | -24.73 % |
| 1989 | 55.52 | -14.61 % |
| 1990 | 49.57 | -10.72 % |
| 1991 | 50.63 | 2.13 % |
| 1992 | 52.45 | 3.61 % |
| 1993 | 57.99 | 10.56 % |
| 1994 | 68.39 | 17.92 % |
| 1995 | 64.40 | -5.83 % |
| 1996 | 80.83 | 25.51 % |
| 1997 | 65.69 | -18.73 % |
| 1998 | 72.86 | 10.92 % |
| 1999 | 68.46 | -6.04 % |
| 2000 | 55.60 | -18.79 % |
| 2001 | 57.65 | 3.68 % |
| 2002 | 55.25 | -4.16 % |
| 2003 | 61.40 | 11.14 % |
| 2004 | 61.67 | 0.43 % |
| 2005 | 57.53 | -6.72 % |
| 2006 | 60.95 | 5.95 % |
| 2007 | 55.47 | -8.99 % |
| 2008 | 52.07 | -6.13 % |
| 2009 | 55.46 | 6.51 % |
| 2010 | 52.58 | -5.19 % |
|
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