I was curious as to how much music is in the public domain with a per year breakdown. Equally, how much is released straight into the public domain per year the

I was curious as to how much music is in the public domain with a per year breakdown. Equally, how much is released straight into the public domain per year these days compared to older copyrighted material lapsing into the public domain. Alas a quick search yielded nothing standout at all data wise.