Why are there so few women coaching at curling's top level in Canada?

Just three of the 36 teams competing at this year's Scotties and Brier had female coaches.

Why are there so few women coaching at curling's top level in Canada?
Two woman — one with a red shirt labelled NU and one with a blue shirt labelled NS — pose for a photo.

Just three of the 36 teams competing at this year's Scotties and Brier had female coaches.