|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 38.81 | NA |
| 1993 | 40.55 | 4.49 % |
| 1994 | 45.33 | 11.78 % |
| 1995 | 41.04 | -9.45 % |
| 1996 | 30.36 | -26.03 % |
| 1997 | 26.16 | -13.82 % |
| 1998 | 30.17 | 15.29 % |
| 1999 | 18.06 | -40.14 % |
| 2000 | 16.13 | -10.71 % |
| 2001 | 24.04 | 49.10 % |
| 2002 | 12.85 | -46.55 % |
| 2003 | 11.00 | -14.40 % |
| 2004 | 10.75 | -2.29 % |
| 2005 | 13.27 | 23.44 % |
| 2006 | 9.79 | -26.23 % |
| 2007 | 11.93 | 21.91 % |
| 2008 | 7.88 | -33.95 % |
| 2009 | 10.90 | 38.24 % |
| 2010 | 9.86 | -9.53 % |
|
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