Betfair trading – Football trading – Who scores first?

I’m just watching the Man City vs West Ham match and West Ham have taken a ‘shock’ lead according to most sources, but how often does the away team score first?

Goals

Football is a generally low scoring contest, but not only that you can have a lot of shots and still not score. The chance of a goal from a statistical perspective is interesting because goals are ‘rare’. This lends itself to seeing away teams taking a ‘shock’ lead