|
| year | consumption | change |
| 1984 | 31.27 | NA |
| 1985 | 33.45 | 6.96 % |
| 1986 | 26.02 | -22.20 % |
| 1987 | 36.39 | 39.83 % |
| 1988 | 33.72 | -7.32 % |
| 1989 | 27.62 | -18.08 % |
| 1990 | 35.83 | 29.70 % |
| 1991 | 34.78 | -2.94 % |
| 1992 | 31.70 | -8.83 % |
| 1993 | 36.47 | 15.04 % |
| 1994 | 35.70 | -2.13 % |
| 1995 | 38.06 | 6.62 % |
| 1996 | 36.63 | -3.75 % |
| 1997 | 36.09 | -1.48 % |
| 1998 | 35.84 | -0.69 % |
| 1999 | 32.04 | -10.62 % |
| 2000 | 35.81 | 11.79 % |
| 2001 | 47.96 | 33.92 % |
| 2002 | 48.37 | 0.86 % |
| 2003 | 56.87 | 17.57 % |
| 2004 | 46.54 | -18.18 % |
| 2005 | 47.85 | 2.82 % |
| 2006 | 50.56 | 5.67 % |
| 2007 | 56.15 | 11.05 % |
| 2008 | 48.26 | -14.05 % |
| 2009 | 48.05 | -0.44 % |
| 2010 | 45.83 | -4.61 % |
|
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