Existence, Uniqueness & Bifurcations · Hard problem

A fish stock (in tonnes) obeys $y' = 2y\left(1 - \dfrac{y}{100}\right) - h$ with a constant harvest $h$ (tonnes per year). The stock sits at its stable equilibrium with $h = 32$. The harvest is then raised by $50\%$ and the stock settles at the new stable equilibrium. By how many tonnes has the stable stock fallen?