|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 15.21 | NA |
| 1987 | 13.68 | -10.03 % |
| 1988 | 13.50 | -1.35 % |
| 1989 | 14.23 | 5.41 % |
| 1990 | 13.02 | -8.45 % |
| 1991 | 11.50 | -11.71 % |
| 1992 | 11.83 | 2.85 % |
| 1993 | 11.65 | -1.52 % |
| 1994 | 13.00 | 11.61 % |
| 1995 | 12.08 | -7.07 % |
| 1996 | 11.60 | -3.98 % |
| 1997 | 4.60 | -60.34 % |
| 1998 | 3.22 | -30.02 % |
| 1999 | 3.01 | -6.58 % |
| 2000 | 4.71 | 56.61 % |
| 2001 | 3.66 | -22.21 % |
| 2002 | 2.50 | -31.79 % |
| 2003 | 2.71 | 8.47 % |
| 2004 | 5.42 | 99.92 % |
| 2005 | 5.36 | -1.09 % |
| 2006 | 2.86 | -46.66 % |
| 2007 | 8.76 | 206.45 % |
| 2008 | 1.84 | -79.02 % |
| 2009 | 1.65 | -10.14 % |
| 2010 | 1.67 | 1.28 % |
|
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