|
| year | consumption | change |
| 1980 | 1.10 | NA |
| 1981 | 1.09 | -0.87 % |
| 1982 | 1.03 | -4.76 % |
| 1983 | 1.04 | 0.55 % |
| 1984 | 1.07 | 2.40 % |
| 1985 | 1.09 | 2.13 % |
| 1986 | 1.08 | -0.42 % |
| 1987 | 1.03 | -4.69 % |
| 1988 | 1.11 | 7.98 % |
| 1989 | 1.13 | 1.37 % |
| 1990 | 1.16 | 3.06 % |
| 1991 | 1.22 | 4.97 % |
| 1992 | 1.20 | -1.82 % |
| 1993 | 1.24 | 3.36 % |
| 1994 | 1.23 | -0.64 % |
| 1995 | 1.29 | 4.54 % |
| 1996 | 1.34 | 3.85 % |
| 1997 | 1.35 | 1.17 % |
| 1998 | 1.38 | 1.90 % |
| 1999 | 1.38 | 0.32 % |
| 2000 | 1.39 | 0.14 % |
| 2001 | 1.44 | 3.89 % |
| 2002 | 1.45 | 0.77 % |
| 2003 | 1.47 | 1.35 % |
| 2004 | 1.51 | 2.66 % |
| 2005 | 1.55 | 2.72 % |
| 2006 | 1.54 | -0.93 % |
| 2007 | 1.54 | 0.52 % |
| 2008 | 1.53 | -0.68 % |
| 2009 | 1.47 | -3.84 % |
| 2010 | 1.53 | 3.54 % |
|
|