Today is the final day of the winter registration period for soccer in England. This is marketed as ‘deadline day’. The Premier League explain the logistics of the system here. This day usually is associated with frantic negotiations.The graph below shows the number of summer deadline day (permanent) transfers to Premier League Clubs from 2008 to 2014. I gathered the data from a range of websites, most prominently the BBC, the Telegraph and the Express. I thinks it’s reasonably accurate. Approximately seven permanent transfers on average occurred on summer deadline days from 2008 to 2014.