|
| year | consumption | change |
| 1980 | 2.06 | NA |
| 1981 | 2.05 | -0.64 % |
| 1982 | 1.94 | -5.65 % |
| 1983 | 1.84 | -4.82 % |
| 1984 | 1.91 | 3.55 % |
| 1985 | 2.00 | 4.94 % |
| 1986 | 2.07 | 3.21 % |
| 1987 | 2.10 | 1.66 % |
| 1988 | 2.09 | -0.45 % |
| 1989 | 2.15 | 2.90 % |
| 1990 | 2.19 | 1.75 % |
| 1991 | 2.27 | 3.90 % |
| 1992 | 2.24 | -1.54 % |
| 1993 | 2.24 | 0.11 % |
| 1994 | 2.38 | 5.99 % |
| 1995 | 2.44 | 2.64 % |
| 1996 | 2.59 | 6.07 % |
| 1997 | 2.65 | 2.28 % |
| 1998 | 2.70 | 1.98 % |
| 1999 | 2.66 | -1.60 % |
| 2000 | 2.73 | 2.96 % |
| 2001 | 2.70 | -1.14 % |
| 2002 | 2.68 | -0.86 % |
| 2003 | 2.78 | 3.84 % |
| 2004 | 2.81 | 0.92 % |
| 2005 | 2.78 | -1.04 % |
| 2006 | 2.74 | -1.48 % |
| 2007 | 2.74 | -0.05 % |
| 2008 | 2.91 | 6.53 % |
| 2009 | 2.65 | -8.94 % |
| 2010 | 2.75 | 3.53 % |
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