I'll qualify this post by saying I'm no expert in genetics.

I was looking over the
Distribution of European Y-chromosome DNA (Y-DNA) haplogroups by country in percentage - link


and I had a question about the distribution of percentages and why it differs so much between say Scotland (or western Europe in general) and Scandinavians.

For example Scotland has a very high R1b at 72.5%, Basques 86% etc, but when you look at Norway its highest single haplogroup percentage is 36% and Sweden 37% for I1.

My question is why are Scandinavian percentage more evenly spread over various haplogroups and does this mean anything?