|
| year | consumption | change |
| 1980 | 5.60 | NA |
| 1981 | 5.50 | -1.79 % |
| 1982 | 5.60 | 1.82 % |
| 1983 | 5.70 | 1.79 % |
| 1984 | 5.70 | 0.00 % |
| 1985 | 5.34 | -6.38 % |
| 1986 | 6.63 | 24.29 % |
| 1987 | 6.95 | 4.78 % |
| 1988 | 7.12 | 2.43 % |
| 1989 | 6.87 | -3.47 % |
| 1990 | 9.30 | 35.33 % |
| 1991 | 7.20 | -22.61 % |
| 1992 | 7.41 | 2.98 % |
| 1993 | 7.62 | 2.89 % |
| 1994 | 7.84 | 2.88 % |
| 1995 | 7.77 | -0.95 % |
| 1996 | 7.84 | 0.92 % |
| 1997 | 7.86 | 0.27 % |
| 1998 | 7.91 | 0.57 % |
| 1999 | 7.91 | 0.00 % |
| 2000 | 8.21 | 3.86 % |
| 2001 | 8.30 | 1.12 % |
| 2002 | 8.36 | 0.69 % |
| 2003 | 8.40 | 0.49 % |
| 2004 | 8.48 | 0.93 % |
| 2005 | 8.74 | 3.10 % |
| 2006 | 8.67 | -0.79 % |
| 2007 | 8.56 | -1.33 % |
| 2008 | 8.97 | 4.80 % |
| 2009 | 9.09 | 1.33 % |
| 2010 | 9.09 | 0.00 % |
| 2011 | | NA |
|
|