|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 55.01 | NA |
| 1987 | 50.88 | -7.50 % |
| 1988 | 57.02 | 12.07 % |
| 1989 | 50.90 | -10.73 % |
| 1990 | 71.47 | 40.41 % |
| 1991 | 65.22 | -8.74 % |
| 1992 | 61.21 | -6.16 % |
| 1993 | 74.11 | 21.07 % |
| 1994 | 63.79 | -13.92 % |
| 1995 | 72.91 | 14.30 % |
| 1996 | 73.50 | 0.81 % |
| 1997 | 83.54 | 13.65 % |
| 1998 | 88.67 | 6.14 % |
| 1999 | 75.47 | -14.88 % |
| 2000 | 49.40 | -34.55 % |
| 2001 | 46.55 | -5.76 % |
| 2002 | 62.27 | 33.76 % |
| 2003 | 36.36 | -41.62 % |
| 2004 | 35.51 | -2.32 % |
| 2005 | 36.68 | 3.28 % |
| 2006 | 46.51 | 26.80 % |
| 2007 | 41.82 | -10.08 % |
| 2008 | 46.26 | 10.60 % |
| 2009 | 29.98 | -35.19 % |
| 2010 | 22.22 | -25.89 % |
|
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