Below is a plot of all independence Y/N polling data going back to 2011. For each year, an average has been taken of all polls from individual pollsters (from the what Scotland thinks website)*. These averages were then combined to give a single new average value for all, ensuring no specific pollster bias. In all years bar 2015, some form of mandate existed for an independence referendum, making that year slightly anomalous in the series; people were free to use Y/N polling as a 'protest', e.g. for more devolution, without fear it might prompt the Scottish Government to hold another vote. In terms of the overall data trend, it can be seen that the series is characterised by a decadal steady increase in support for independence which varies on the shorter term between a 'baseline' and 'upper bound'. The baseline can be assumed to be those that will always vote Yes 'tomorrow', no questions asked. They are mainly Scottish people who just do not identify as
