I don’t know what percentage of errors are caught by static typing, but I do know what percentage of my time has been saved by switching to a statically typed language. I love clojure, but I spent at least an order of magnitude more time tracking down various bugs than I do now, simply because the compiler didn’t catch them for me.
I totally respect anyone for just choosing a language that works best for them. They are tools for craftsman, and often are about which one makes you a better programmer.
For me, Clojure definitely made me way more productive. My background was in statically typed language mostly prior, though I had done some Python and JavaScript as well. With Clojure I feel I'm between 30% to 300% more productive overall. I think some of this is personal, depends on your style and your own strengths and weaknesses.
