It's very common practice in Scottish dances to play a set of four tunes, three in major modes and one (usually the second or third) in a minor mode. Numerically less than 25% of the tunes in the repertoire may be in minor modes but they are played disproportionately often.

Breathnach did some counting of the British Isles repertoires and concluded there was no national difference in the representation of the four common modes. (As I've said in several places, I don't think that would still hold if you looked at the use of gapped scales; significantly more gaps in Scottish tunes than in English or Irish ones).