|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | | NA |
| 1987 | | NA |
| 1988 | | NA |
| 1989 | | NA |
| 1990 | | NA |
| 1991 | | NA |
| 1992 | 13.30 | NA |
| 1993 | 11.61 | -12.67 % |
| 1994 | 15.00 | 29.15 % |
| 1995 | 16.17 | 7.83 % |
| 1996 | 14.82 | -8.36 % |
| 1997 | 18.33 | 23.64 % |
| 1998 | 17.22 | -6.02 % |
| 1999 | 18.28 | 6.11 % |
| 2000 | 18.27 | -0.02 % |
| 2001 | 17.62 | -3.56 % |
| 2002 | 19.09 | 8.36 % |
| 2003 | 17.67 | -7.47 % |
| 2004 | 16.85 | -4.63 % |
| 2005 | 16.90 | 0.27 % |
| 2006 | 16.59 | -1.80 % |
| 2007 | 16.92 | 1.97 % |
| 2008 | 16.24 | -4.01 % |
| 2009 | 16.15 | -0.58 % |
| 2010 | 15.19 | -5.93 % |
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