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| year | consumption | change |
| 1980 | 3.90 | NA |
| 1981 | 3.60 | -7.69% |
| 1982 | 3.60 | 0.00% |
| 1983 | 3.90 | 8.33% |
| 1984 | 4.10 | 5.13% |
| 1985 | 4.40 | 7.32% |
| 1986 | 4.60 | 4.55% |
| 1987 | 4.50 | -2.17% |
| 1988 | 4.70 | 4.44% |
| 1989 | 4.80 | 2.13% |
| 1990 | 4.40 | -8.33% |
| 1991 | 4.40 | 0.00% |
| 1992 | 4.20 | -4.55% |
| 1993 | 3.90 | -7.14% |
| 1994 | 4.00 | 2.56% |
| 1995 | 4.50 | 12.50% |
| 1996 | 4.70 | 4.44% |
| 1997 | 4.40 | -6.38% |
| 1998 | 4.10 | -6.82% |
| 1999 | 4.40 | 7.32% |
| 2000 | 4.50 | 2.27% |
| 2001 | 4.60 | 2.22% |
| 2002 | 4.40 | -4.35% |
| 2003 | 4.60 | 4.55% |
| 2004 | 4.60 | 0.00% |
| 2005 | 4.80 | 4.35% |
| 2006 | 5.70 | 18.75% |
| 2007 | 6.10 | 7.02% |
| 2008 | 6.00 | -1.64% |
| 2009 | 6.60 | 10.00% |
| 2010 | 6.70 | 1.52% |
| 2011 | 7.10 | 5.97% |
| 2012 | 7.30 | 2.82% |
| 2013 | 7.90 | 8.22% |
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