A very good point; I wouldn’t mind knowing those statistics at the time of 1922 myself.
To be honest, I’m a far stretch from an expert in this area by any means. I do know that there was a huge shift in Irish attitudes towards nationalism after 1916. Before the Rising, Irish opinion towards British rule was much more diverse; supporters of republicanism existed but were in smaller in number when compared to supporters of Home Rule, spearheaded by John Redmond. Supporters for British rule were also higher as well, I have no doubt. It was only following the reaction of British authorities in Dublin that the public opinion firmly swayed in favour of republicanism.