|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 117.22 | NA |
| 1993 | 95.18 | -18.80 % |
| 1994 | 81.50 | -14.37 % |
| 1995 | 80.26 | -1.53 % |
| 1996 | 66.78 | -16.79 % |
| 1997 | 58.36 | -12.60 % |
| 1998 | 45.81 | -21.50 % |
| 1999 | 38.19 | -16.63 % |
| 2000 | 45.78 | 19.87 % |
| 2001 | 44.23 | -3.40 % |
| 2002 | 36.67 | -17.10 % |
| 2003 | 37.56 | 2.44 % |
| 2004 | 39.95 | 6.35 % |
| 2005 | 49.67 | 24.35 % |
| 2006 | 50.69 | 2.04 % |
| 2007 | 48.17 | -4.96 % |
| 2008 | 37.73 | -21.67 % |
| 2009 | 23.34 | -38.16 % |
| 2010 | 24.94 | 6.87 % |
|
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