They may appear similar but your chart tells the difference. Look at the volumes, we haven't even begun to see the same increase in volumes yet. Also keep in mind back then shares on offer was much lower so the difference in volumes in 2014 and even 2016 to now is massive given the factor in play. Perhaps volumes in excess of 2-5million would be an indication of the start of a similar trend to those old graphs, or perhaps 10-20million if sentiment change is swift. If we are at the start of those old trends then we are right at the very base of increase in SP.