| Year | 1960 | 1970 | 1980 | 1990 | 2000 | 2010 | 2014 |
| Austria | 25.1 | 25.5 | 25.9 | 26.1 | 26.4 | 26.5 | 26.6 |
| Belgium | 25.4 | 25.8 | 26.2 | 26.4 | 26.6 | 26.8 | 26.8 |
| Denmark | 25.1 | 25.5 | 25.8 | 26.0 | 26.2 | 26.3 | 26.3 |
| Finland | 24.5 | 25.0 | 25.4 | 25.7 | 25.9 | 26.1 | 26.1 |
| France | 27.0 | 27.5 | 27.9 | 28.1 | 28.3 | 28.5 | 28.5 |
| Germany |
| 27.9 | 28.2 | 28.4 | 28.6 | 28.7 | 28.8 |
| Greece | 24.5 | 25.3 | 25.7 | 25.8 | 26.0 | 26.2 | 26.0 |
| Ireland |
| 24.3 | 24.7 | 25.1 | 25.8 | 26.1 | 26.2 |
| Italy | 26.8 | 27.4 | 27.8 | 28.0 | 28.2 | 28.2 | 28.2 |
| Netherlands | 25.8 | 26.3 | 26.6 | 26.8 | 27.1 | 27.3 | 27.3 |
| Portugal | 24.2 | 24.9 | 25.3 | 25.6 | 25.9 | 26.0 | 26.0 |
| Spain | 26.0 | 26.7 | 27.0 | 27.3 | 27.6 | 27.8 | 27.8 |
| Sweden | 25.4 | 25.9 | 26.1 | 26.3 | 26.5 | 26.8 | 26.8 |
| United Kingdom | 27.3 | 27.6 | 27.8 | 28.0 | 28.3 | 28.5 | 28.6 |