Consider adding a logarithmic y-axis to each graph, but otherwise, nice presentation!
Edit: also, perhaps y-axes of the form "Thousands of X", then increments can show "200, 400, 600..." and so on. Simpler to digest when lots of zeroes come into play, at least for me.
Edit: also, perhaps y-axes of the form "Thousands of X", then increments can show "200, 400, 600..." and so on. Simpler to digest when lots of zeroes come into play, at least for me.