What's the proportion of people who work their way up to management from code-monkey, versus being hired directly into a management role? If it's highly skewed

What's the proportion of people who work their way up to management from code-monkey, versus being hired directly into a management role? If it's highly skewed towards "promoted from code-monkey", then there's a big barrier to entry if you're the kind of person who loves managing and dislikes code-monkeying.