|
| year | consumption | change |
| 1980 | 5.07 | NA |
| 1981 | 4.58 | -9.69 % |
| 1982 | 4.58 | 0.15 % |
| 1983 | 4.59 | 0.22 % |
| 1984 | 4.76 | 3.51 % |
| 1985 | 4.91 | 3.32 % |
| 1986 | 5.00 | 1.77 % |
| 1987 | 5.16 | 3.24 % |
| 1988 | 5.06 | -2.02 % |
| 1989 | 4.86 | -3.89 % |
| 1990 | 3.95 | -18.74 % |
| 1991 | 3.87 | -2.01 % |
| 1992 | 3.83 | -0.93 % |
| 1993 | 3.97 | 3.47 % |
| 1994 | 3.82 | -3.82 % |
| 1995 | 3.70 | -3.03 % |
| 1996 | 4.14 | 11.86 % |
| 1997 | 4.08 | -1.33 % |
| 1998 | 3.85 | -5.78 % |
| 1999 | 3.98 | 3.32 % |
| 2000 | 3.62 | -8.86 % |
| 2001 | 3.45 | -4.68 % |
| 2002 | 3.45 | -0.04 % |
| 2003 | 3.57 | 3.43 % |
| 2004 | 3.75 | 4.92 % |
| 2005 | 3.67 | -1.95 % |
| 2006 | 3.85 | 4.83 % |
| 2007 | 3.92 | 1.73 % |
| 2008 | 3.89 | -0.70 % |
| 2009 | 3.78 | -2.76 % |
| 2010 | 4.06 | 7.19 % |
|
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