|
| year | consumption | change |
| 1984 | 49.84 | NA |
| 1985 | 49.23 | -1.22 % |
| 1986 | 44.42 | -9.76 % |
| 1987 | 44.78 | 0.80 % |
| 1988 | 34.67 | -22.57 % |
| 1989 | 31.93 | -7.90 % |
| 1990 | 30.25 | -5.27 % |
| 1991 | 37.15 | 22.79 % |
| 1992 | 41.66 | 12.15 % |
| 1993 | 46.07 | 10.58 % |
| 1994 | 46.23 | 0.34 % |
| 1995 | 44.05 | -4.70 % |
| 1996 | 39.86 | -9.51 % |
| 1997 | 40.24 | 0.95 % |
| 1998 | 39.53 | -1.76 % |
| 1999 | 36.35 | -8.05 % |
| 2000 | 26.77 | -26.36 % |
| 2001 | 23.05 | -13.90 % |
| 2002 | 13.23 | -42.58 % |
| 2003 | 12.44 | -5.96 % |
| 2004 | 8.25 | -33.74 % |
| 2005 | 4.32 | -47.67 % |
| 2006 | 4.07 | -5.78 % |
| 2007 | 3.87 | -4.92 % |
| 2008 | 3.26 | -15.61 % |
| 2009 | 3.98 | 21.86 % |
| 2010 | 1.58 | -60.23 % |
|
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