|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 27.76 | NA |
| 1987 | 25.71 | -7.41 % |
| 1988 | 26.62 | 3.53 % |
| 1989 | 26.22 | -1.47 % |
| 1990 | 25.36 | -3.31 % |
| 1991 | 22.67 | -10.59 % |
| 1992 | 20.09 | -11.38 % |
| 1993 | 19.86 | -1.12 % |
| 1994 | 20.00 | 0.68 % |
| 1995 | 20.88 | 4.39 % |
| 1996 | 25.40 | 21.66 % |
| 1997 | 12.20 | -51.97 % |
| 1998 | 9.32 | -23.57 % |
| 1999 | 9.49 | 1.75 % |
| 2000 | 10.81 | 13.97 % |
| 2001 | 13.08 | 20.98 % |
| 2002 | 8.06 | -38.37 % |
| 2003 | 9.61 | 19.13 % |
| 2004 | 8.31 | -13.48 % |
| 2005 | 8.28 | -0.39 % |
| 2006 | 10.41 | 25.79 % |
| 2007 | 19.68 | 89.00 % |
| 2008 | 7.40 | -62.39 % |
| 2009 | 5.75 | -22.32 % |
| 2010 | 6.19 | 7.72 % |
|
|