|
| year | consumption | change |
| 1980 | | NA |
| 1981 | | NA |
| 1982 | 7.80 | NA |
| 1983 | 10.60 | 35.90 % |
| 1984 | 10.70 | 0.94 % |
| 1985 | 12.90 | 20.56 % |
| 1986 | 13.60 | 5.46 % |
| 1987 | 13.95 | 2.57 % |
| 1988 | 13.19 | -5.48 % |
| 1989 | 13.43 | 1.81 % |
| 1990 | 13.71 | 2.10 % |
| 1991 | 12.77 | -6.86 % |
| 1992 | 7.21 | -43.53 % |
| 1993 | 6.97 | -3.31 % |
| 1994 | 6.67 | -4.37 % |
| 1995 | 6.36 | -4.55 % |
| 1996 | 6.00 | -5.78 % |
| 1997 | 5.62 | -6.27 % |
| 1998 | 5.33 | -5.08 % |
| 1999 | 5.33 | 0.00 % |
| 2000 | 4.72 | -11.43 % |
| 2001 | 4.69 | -0.68 % |
| 2002 | 4.79 | 1.97 % |
| 2003 | 3.81 | -20.31 % |
| 2004 | 4.12 | 8.05 % |
| 2005 | 4.44 | 7.79 % |
| 2006 | 4.40 | -0.82 % |
| 2007 | 4.51 | 2.45 % |
| 2008 | 4.98 | 10.28 % |
| 2009 | 36.25 | 628.60 % |
| 2010 | 36.25 | 0.00 % |
| 2011 | | NA |
|
|