|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 80.01 | NA |
| 1987 | 81.81 | 2.25 % |
| 1988 | 81.59 | -0.27 % |
| 1989 | 68.78 | -15.70 % |
| 1990 | 49.29 | -28.34 % |
| 1991 | 31.41 | -36.27 % |
| 1992 | 32.05 | 2.04 % |
| 1993 | 29.27 | -8.66 % |
| 1994 | 27.21 | -7.05 % |
| 1995 | 30.36 | 11.58 % |
| 1996 | 32.20 | 6.05 % |
| 1997 | 25.99 | -19.29 % |
| 1998 | 25.10 | -3.41 % |
| 1999 | 26.63 | 6.11 % |
| 2000 | 18.94 | -28.90 % |
| 2001 | 18.40 | -2.85 % |
| 2002 | 31.64 | 71.98 % |
| 2003 | 29.78 | -5.88 % |
| 2004 | 35.63 | 19.65 % |
| 2005 | 39.57 | 11.06 % |
| 2006 | 41.23 | 4.19 % |
| 2007 | 40.14 | -2.65 % |
| 2008 | 38.44 | -4.22 % |
| 2009 | 38.98 | 1.40 % |
| 2010 | 36.59 | -6.14 % |
|
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