|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 17.16 | NA |
| 1987 | 18.60 | 8.40 % |
| 1988 | 22.34 | 20.11 % |
| 1989 | 24.96 | 11.71 % |
| 1990 | 27.44 | 9.95 % |
| 1991 | 29.81 | 8.65 % |
| 1992 | 32.13 | 7.76 % |
| 1993 | 32.22 | 0.27 % |
| 1994 | 29.42 | -8.68 % |
| 1995 | 34.86 | 18.49 % |
| 1996 | 30.98 | -11.13 % |
| 1997 | 28.66 | -7.48 % |
| 1998 | 36.07 | 25.85 % |
| 1999 | 36.08 | 0.02 % |
| 2000 | 40.14 | 11.26 % |
| 2001 | 40.63 | 1.22 % |
| 2002 | 39.03 | -3.93 % |
| 2003 | 39.55 | 1.32 % |
| 2004 | 38.92 | -1.58 % |
| 2005 | 36.33 | -6.65 % |
| 2006 | 40.42 | 11.26 % |
| 2007 | 40.54 | 0.30 % |
| 2008 | 47.61 | 17.42 % |
| 2009 | 28.82 | -39.46 % |
| 2010 | 27.10 | -5.97 % |
|
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