|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 40.00 | NA |
| 1987 | 40.90 | 2.24 % |
| 1988 | 39.62 | -3.12 % |
| 1989 | 33.07 | -16.54 % |
| 1990 | 31.20 | -5.65 % |
| 1991 | 16.62 | -46.74 % |
| 1992 | 20.41 | 22.84 % |
| 1993 | 20.69 | 1.35 % |
| 1994 | 22.74 | 9.92 % |
| 1995 | 26.92 | 18.40 % |
| 1996 | 22.58 | -16.12 % |
| 1997 | 20.44 | -9.46 % |
| 1998 | 18.79 | -8.09 % |
| 1999 | 18.35 | -2.36 % |
| 2000 | 15.43 | -15.90 % |
| 2001 | 13.65 | -11.54 % |
| 2002 | 21.22 | 55.48 % |
| 2003 | 13.76 | -35.13 % |
| 2004 | 13.21 | -4.00 % |
| 2005 | 14.72 | 11.42 % |
| 2006 | 14.19 | -3.65 % |
| 2007 | 13.95 | -1.65 % |
| 2008 | 14.23 | 2.01 % |
| 2009 | 14.63 | 2.79 % |
| 2010 | 13.91 | -4.95 % |
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