|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 46.68 | NA |
| 1987 | 40.09 | -14.11 % |
| 1988 | 37.31 | -6.94 % |
| 1989 | 42.78 | 14.66 % |
| 1990 | 48.00 | 12.20 % |
| 1991 | 47.39 | -1.27 % |
| 1992 | 57.51 | 21.36 % |
| 1993 | 62.53 | 8.73 % |
| 1994 | 60.76 | -2.83 % |
| 1995 | 66.45 | 9.37 % |
| 1996 | 59.20 | -10.92 % |
| 1997 | 56.08 | -5.27 % |
| 1998 | 47.21 | -15.80 % |
| 1999 | 52.09 | 10.34 % |
| 2000 | 49.28 | -5.40 % |
| 2001 | 53.78 | 9.11 % |
| 2002 | 53.39 | -0.72 % |
| 2003 | 54.23 | 1.57 % |
| 2004 | 44.11 | -18.66 % |
| 2005 | 51.38 | 16.48 % |
| 2006 | 41.21 | -19.79 % |
| 2007 | 40.67 | -1.31 % |
| 2008 | 29.82 | -26.68 % |
| 2009 | 23.88 | -19.91 % |
| 2010 | 20.27 | -15.11 % |
|
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