|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 8.56 | NA |
| 1993 | 18.43 | 115.29 % |
| 1994 | 17.78 | -3.50 % |
| 1995 | 19.07 | 7.23 % |
| 1996 | 18.40 | -3.50 % |
| 1997 | 22.01 | 19.63 % |
| 1998 | 18.65 | -15.29 % |
| 1999 | 18.23 | -2.26 % |
| 2000 | 18.60 | 2.03 % |
| 2001 | 18.67 | 0.40 % |
| 2002 | 17.76 | -4.88 % |
| 2003 | 17.50 | -1.45 % |
| 2004 | 15.52 | -11.32 % |
| 2005 | 15.87 | 2.23 % |
| 2006 | 14.96 | -5.74 % |
| 2007 | 14.49 | -3.12 % |
| 2008 | 15.03 | 3.71 % |
| 2009 | 13.81 | -8.09 % |
| 2010 | 13.23 | -4.23 % |
|
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