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| year | consumption | change |
| 1980 | 3.60 | NA |
| 1981 | 3.40 | -5.56% |
| 1982 | 3.40 | 0.00% |
| 1983 | 3.60 | 5.88% |
| 1984 | 3.80 | 5.56% |
| 1985 | 3.80 | 0.00% |
| 1986 | 3.80 | 0.00% |
| 1987 | 3.90 | 2.63% |
| 1988 | 4.00 | 2.56% |
| 1989 | 4.10 | 2.50% |
| 1990 | 4.10 | 0.00% |
| 1991 | 4.30 | 4.88% |
| 1992 | 4.20 | -2.33% |
| 1993 | 4.40 | 4.76% |
| 1994 | 4.70 | 6.82% |
| 1995 | 5.00 | 6.38% |
| 1996 | 4.90 | -2.00% |
| 1997 | 5.20 | 6.12% |
| 1998 | 5.30 | 1.92% |
| 1999 | 5.50 | 3.77% |
| 2000 | 5.80 | 5.45% |
| 2001 | 6.20 | 6.90% |
| 2002 | 5.70 | -8.06% |
| 2003 | 6.00 | 5.26% |
| 2004 | 6.20 | 3.33% |
| 2005 | 6.00 | -3.23% |
| 2006 | 6.40 | 6.67% |
| 2007 | 6.60 | 3.13% |
| 2008 | 6.40 | -3.03% |
| 2009 | 5.90 | -7.81% |
| 2010 | 6.40 | 8.47% |
| 2011 | 6.30 | -1.56% |
| 2012 | 6.10 | -3.17% |
| 2013 | 6.10 | 0.00% |
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