Calculate margin usage fractions bounded to [0, 1] unbounded margin usage = (unweighted health - initial/maint health) / unweighted health iff subaccount has borrows or perp positions, and 0 otherwise.
Calculate margin usage fractions bounded to [0, 1] unbounded margin usage = (unweighted health - initial/maint health) / unweighted health iff subaccount has borrows or perp positions, and 0 otherwise.