There was much talk before this year's World Economic Forum about the fact it would be co-chaired by seven women. At one level it was a statement of how far gender equality has come at Davos, but it has also drawn attention to how far there is still to go.

The seven chairs are all extraordinarily impressive women at the top of their professions, and more powerful leaders have gathered here at Davos than ever before. But only one in five delegates to the Forum are female.