I wouldn't count on such 'percentages' as a general rule. They sound like 'everyday' conversation. But words/bodylanguage/tone are each best for communicating certain types of info. So for some conversations tone will be most important, but other conversations are dominated by words, etc. It all depends on the topic of conversation and each person's conversational style.
Some people have styles that rely a great deal on tone and body language - their actual speech is often just a series of emotive grunts (really, it is amazing). On the other hand, some people have styles that rely on words more than anything else. If you are speaking to someone who has a strong accent then you don't get much info from voice tone. Or if you are talking about an airy intellectual topic, then words are essential for expressing certain things.
Even for scientific topics, concepts that take 15+ minutes to learn from a textbook take only 3 minutes to learn from a good lecturer. Tone and body language are important there. In particular, watching a person describe and draw a chart is *much* more informative than reading the chart in a book. Just from the 'body language of drawing' you can tell how important each feature of the chart is, how the things on the chart relate to each other, etc. Well, that is my experience anyway...
Also body language of the listener gives the speaker a lot of feedback that lets him/her tailor the speech to the audience, which improves communication a lot. e.g. lecturers often say 'I see a lot of frowns in the audience, so I'm not explaining this well. Any questions?'. Sadly it seems that most of these signals are subtle and a bit unreliable, so I am not good at picking them up
Perhaps if you cultivate a communication style that relies on words alone, other people will notice and communicate with you in the same way. But I suspect that people will just stick to the comfort of their own natural styles.