|
| year | consumption | change |
| 1980 | 2.07 | NA |
| 1981 | 2.04 | -1.57 % |
| 1982 | 1.88 | -7.81 % |
| 1983 | 1.94 | 2.93 % |
| 1984 | 2.03 | 4.78 % |
| 1985 | 2.17 | 6.77 % |
| 1986 | 2.20 | 1.48 % |
| 1987 | 2.27 | 3.07 % |
| 1988 | 2.23 | -1.63 % |
| 1989 | 2.20 | -1.42 % |
| 1990 | 2.22 | 0.93 % |
| 1991 | 2.21 | -0.20 % |
| 1992 | 2.24 | 1.37 % |
| 1993 | 2.24 | -0.03 % |
| 1994 | 2.26 | 0.68 % |
| 1995 | 2.31 | 2.21 % |
| 1996 | 2.27 | -1.57 % |
| 1997 | 2.32 | 1.95 % |
| 1998 | 2.40 | 3.68 % |
| 1999 | 2.37 | -1.45 % |
| 2000 | 2.27 | -4.11 % |
| 2001 | 2.40 | 5.91 % |
| 2002 | 2.28 | -5.32 % |
| 2003 | 2.17 | -4.71 % |
| 2004 | 2.31 | 6.43 % |
| 2005 | 2.33 | 1.02 % |
| 2006 | 2.21 | -5.09 % |
| 2007 | 2.29 | 3.25 % |
| 2008 | 2.22 | -2.81 % |
| 2009 | 2.05 | -7.69 % |
| 2010 | 2.22 | 8.35 % |
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