In terms of support measured as the number of seats gained compared to the number of seats available where the party seized 48 % of all seats contested in 1931 - 1936 .
The number of seats available is the region which remained a Carlist stronghold was Navarre .
In terms of support measured as the number of seats gained compared to the number of seats available , the region which remained a Carlist stronghold was Navarre , where the party seized 48 % of all seats contested in 1931 - 1936 .