|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 28.94 | NA |
| 1987 | 27.75 | -4.12 % |
| 1988 | 26.30 | -5.22 % |
| 1989 | 36.00 | 36.88 % |
| 1990 | 43.50 | 20.84 % |
| 1991 | 52.00 | 19.54 % |
| 1992 | 44.62 | -14.20 % |
| 1993 | 43.91 | -1.59 % |
| 1994 | 51.34 | 16.93 % |
| 1995 | 56.66 | 10.35 % |
| 1996 | 68.08 | 20.16 % |
| 1997 | 60.89 | -10.56 % |
| 1998 | 64.09 | 5.25 % |
| 1999 | 54.16 | -15.49 % |
| 2000 | 66.53 | 22.84 % |
| 2001 | 54.28 | -18.40 % |
| 2002 | 64.41 | 18.66 % |
| 2003 | 85.85 | 33.28 % |
| 2004 | 91.62 | 6.71 % |
| 2005 | 92.81 | 1.30 % |
| 2006 | 83.31 | -10.24 % |
| 2007 | 81.26 | -2.45 % |
| 2008 | 91.31 | 12.36 % |
| 2009 | 86.73 | -5.01 % |
| 2010 | 86.93 | 0.24 % |
|
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