I'm in the middle of the Midwest, and I have no bluejays. Why?

I know on the surface, this seems like a simple, silly, stupid question, but I’m serious.

I feed the birds in the winter, and in winters past, cardinals and bluejays were about equal in attendance. I recall commenting last year that there were few bluejays. This year there is an abundance of cardinals and not a single bluejay.

Is this just a local aberration, or is something decimating the bluejay population?