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| year | consumption | change |
| 1980 | 4.60 | NA |
| 1981 | 4.70 | 2.17% |
| 1982 | 4.30 | -8.51% |
| 1983 | 2.30 | -46.51% |
| 1984 | 1.60 | -30.43% |
| 1985 | 2.50 | 56.25% |
| 1986 | 3.80 | 52.00% |
| 1987 | 4.10 | 7.89% |
| 1988 | 4.20 | 2.44% |
| 1989 | 4.60 | 9.52% |
| 1990 | 5.30 | 15.22% |
| 1991 | 5.70 | 7.55% |
| 1992 | 6.10 | 7.02% |
| 1993 | 5.80 | -4.92% |
| 1994 | 5.60 | -3.45% |
| 1995 | 5.60 | 0.00% |
| 1996 | 6.10 | 8.93% |
| 1997 | 6.30 | 3.28% |
| 1998 | 5.10 | -19.05% |
| 1999 | 5.70 | 11.76% |
| 2000 | 6.00 | 5.26% |
| 2001 | 6.50 | 8.33% |
| 2002 | 6.00 | -7.69% |
| 2003 | 4.50 | -25.00% |
| 2004 | 4.50 | 0.00% |
| 2005 | 5.20 | 15.56% |
| 2006 | 6.30 | 21.15% |
| 2007 | 5.30 | -15.87% |
| 2008 | 6.00 | 13.21% |
| 2009 | 6.10 | 1.67% |
| 2010 | 6.60 | 8.20% |
| 2011 | 7.70 | 16.67% |
| 2012 | 8.60 | 11.69% |
| 2013 | 9.60 | 11.63% |
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