Eckhart tolle says that there is a 80% reduction of thinking in his mind:
There is a lot of chit-chat about the silent mind and what comes after thought, but there is nothing as certain as “Speak Thinking” to shut down psychological thinking when it is not needed. When you see that thinking is tied to sub-vocal speech and one cannot exists without the other as a process, you can see how easy it is to come to silence in mind when you want to stop thinking. This is what meditation does – it distracts the mind to silence by using the mantra, but what it is really doing is breaking that link between silently having to speak what you are thinking for you to have to think at all.
What comes after thought: