|
| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 1.10 | 0.00 % |
| 1982 | 1.23 | 11.82 % |
| 1983 | 1.19 | -3.25 % |
| 1984 | 1.23 | 3.36 % |
| 1985 | 1.26 | 2.82 % |
| 1986 | 1.26 | 0.00 % |
| 1987 | 1.30 | 2.93 % |
| 1988 | 1.32 | 1.12 % |
| 1989 | 1.32 | 0.27 % |
| 1990 | 1.38 | 4.48 % |
| 1991 | 1.38 | 0.00 % |
| 1992 | 1.39 | 1.05 % |
| 1993 | 1.35 | -2.82 % |
| 1994 | 1.35 | 0.00 % |
| 1995 | 1.46 | 7.55 % |
| 1996 | 1.45 | -0.27 % |
| 1997 | 1.46 | 0.27 % |
| 1998 | 1.46 | 0.00 % |
| 1999 | 1.46 | 0.00 % |
| 2000 | 1.68 | 15.16 % |
| 2001 | 1.70 | 1.49 % |
| 2002 | 1.70 | 0.00 % |
| 2003 | 1.70 | 0.00 % |
| 2004 | 1.70 | -0.27 % |
| 2005 | 1.92 | 13.38 % |
| 2006 | 1.70 | -11.56 % |
| 2007 | 1.80 | 5.86 % |
| 2008 | 1.70 | -5.54 % |
| 2009 | 1.70 | 0.00 % |
| 2010 | 1.70 | 0.00 % |
| 2011 | | NA |
|
|