Not sure, but a Jock i met on holiday a few yrs ago told me that a large segment of the Tartan army, don't attend league games, they just go to Hampden and all over the world following the national team.
That concurs, had a few pints with a gang of them after a midweek win for Wales a few years back, they claimed to be just followers of the national team, no club allegiance. We remarked that they were like many Welsh rugby fans.