|
| year | consumption | change |
| 1980 | 1.14 | NA |
| 1981 | 1.06 | -7.19 % |
| 1982 | 1.03 | -2.14 % |
| 1983 | 1.09 | 5.00 % |
| 1984 | 1.06 | -2.23 % |
| 1985 | 1.16 | 8.73 % |
| 1986 | 1.16 | 0.85 % |
| 1987 | 1.17 | 0.30 % |
| 1988 | 1.19 | 1.67 % |
| 1989 | 1.15 | -2.99 % |
| 1990 | 1.18 | 2.50 % |
| 1991 | 1.22 | 3.54 % |
| 1992 | 1.23 | 0.98 % |
| 1993 | 1.23 | -0.71 % |
| 1994 | 1.25 | 1.61 % |
| 1995 | 1.24 | -0.49 % |
| 1996 | 1.21 | -2.02 % |
| 1997 | 1.24 | 1.71 % |
| 1998 | 1.26 | 2.37 % |
| 1999 | 1.33 | 4.84 % |
| 2000 | 1.30 | -2.19 % |
| 2001 | 1.35 | 4.16 % |
| 2002 | 1.28 | -4.87 % |
| 2003 | 1.30 | 1.41 % |
| 2004 | 1.31 | 0.76 % |
| 2005 | 1.26 | -3.77 % |
| 2006 | 1.29 | 1.79 % |
| 2007 | 1.30 | 1.30 % |
| 2008 | 1.32 | 1.32 % |
| 2009 | 1.29 | -2.47 % |
| 2010 | 1.27 | -1.72 % |
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