|
| year | consumption | change |
| 1984 | 45.12 | NA |
| 1985 | 43.39 | -3.84 % |
| 1986 | 39.50 | -8.97 % |
| 1987 | 35.11 | -11.12 % |
| 1988 | 33.16 | -5.54 % |
| 1989 | 30.54 | -7.91 % |
| 1990 | 28.80 | -5.69 % |
| 1991 | 28.46 | -1.18 % |
| 1992 | 26.71 | -6.14 % |
| 1993 | 31.70 | 18.66 % |
| 1994 | 38.28 | 20.78 % |
| 1995 | 32.96 | -13.91 % |
| 1996 | 32.84 | -0.36 % |
| 1997 | 25.94 | -21.02 % |
| 1998 | 24.90 | -4.00 % |
| 1999 | 22.72 | -8.75 % |
| 2000 | 22.51 | -0.93 % |
| 2001 | 22.17 | -1.52 % |
| 2002 | 21.13 | -4.68 % |
| 2003 | 22.35 | 5.76 % |
| 2004 | 18.37 | -17.77 % |
| 2005 | 19.35 | 5.28 % |
| 2006 | 25.20 | 30.25 % |
| 2007 | 23.79 | -5.60 % |
| 2008 | 18.87 | -20.65 % |
| 2009 | 12.01 | -36.38 % |
| 2010 | 13.42 | 11.75 % |
|
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