|
| year | consumption | change |
| 1984 | | NA |
| 1985 | | NA |
| 1986 | 7.91 | NA |
| 1987 | 10.17 | 28.53 % |
| 1988 | 8.58 | -15.64 % |
| 1989 | 8.85 | 3.22 % |
| 1990 | 9.23 | 4.28 % |
| 1991 | | NA |
| 1992 | 9.39 | NA |
| 1993 | 9.39 | 0.10 % |
| 1994 | 9.56 | 1.74 % |
| 1995 | 8.53 | -10.76 % |
| 1996 | 8.18 | -4.10 % |
| 1997 | 9.56 | 16.84 % |
| 1998 | 9.01 | -5.78 % |
| 1999 | 9.30 | 3.28 % |
| 2000 | 9.35 | 0.48 % |
| 2001 | 9.42 | 0.77 % |
| 2002 | 9.00 | -4.47 % |
| 2003 | 8.76 | -2.60 % |
| 2004 | 9.09 | 3.72 % |
| 2005 | 9.09 | 0.02 % |
| 2006 | 9.39 | 3.34 % |
| 2007 | 9.75 | 3.73 % |
| 2008 | 11.29 | 15.83 % |
| 2009 | 11.83 | 4.76 % |
| 2010 | 12.85 | 8.70 % |
|
|