|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | 5.40 | NA |
| 1983 | | NA |
| 1984 | | NA |
| 1985 | 5.50 | NA |
| 1986 | 5.86 | 6.63 % |
| 1987 | 6.25 | 6.55 % |
| 1988 | 6.98 | 11.63 % |
| 1989 | 6.82 | -2.19 % |
| 1990 | 6.88 | 0.84 % |
| 1991 | 7.21 | 4.81 % |
| 1992 | 5.28 | -26.84 % |
| 1993 | 5.33 | 1.10 % |
| 1994 | 5.36 | 0.43 % |
| 1995 | 5.66 | 5.72 % |
| 1996 | 5.65 | -0.27 % |
| 1997 | 5.78 | 2.41 % |
| 1998 | 5.81 | 0.42 % |
| 1999 | 5.81 | 0.00 % |
| 2000 | 6.15 | 5.87 % |
| 2001 | 6.29 | 2.34 % |
| 2002 | 6.40 | 1.77 % |
| 2003 | 6.55 | 2.33 % |
| 2004 | 7.79 | 18.92 % |
| 2005 | 7.76 | -0.38 % |
| 2006 | 7.84 | 1.01 % |
| 2007 | 8.40 | 7.09 % |
| 2008 | 9.97 | 18.76 % |
| 2009 | 9.37 | -6.03 % |
| 2010 | 9.37 | 0.00 % |
| 2011 | 10.00 | 6.69 % |
|
|