|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 12.01 | NA |
| 1987 | 14.35 | 19.52 % |
| 1988 | 13.03 | -9.18 % |
| 1989 | 11.63 | -10.77 % |
| 1990 | 10.55 | -9.24 % |
| 1991 | 13.18 | 24.90 % |
| 1992 | 13.28 | 0.78 % |
| 1993 | 16.24 | 22.21 % |
| 1994 | 17.54 | 8.06 % |
| 1995 | 20.08 | 14.44 % |
| 1996 | 20.53 | 2.27 % |
| 1997 | 28.74 | 39.98 % |
| 1998 | 26.09 | -9.24 % |
| 1999 | 30.44 | 16.68 % |
| 2000 | 36.27 | 19.15 % |
| 2001 | 35.47 | -2.21 % |
| 2002 | 37.29 | 5.13 % |
| 2003 | 36.16 | -3.02 % |
| 2004 | 36.53 | 1.02 % |
| 2005 | 35.31 | -3.36 % |
| 2006 | 31.46 | -10.88 % |
| 2007 | 36.09 | 14.72 % |
| 2008 | 31.52 | -12.68 % |
| 2009 | 29.95 | -4.97 % |
| 2010 | 29.17 | -2.60 % |
|
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