I believe the percentage for information exchange is a bit higher, even in everyday life. I mean we also socialize, talk about the weather etc. But many times I open my mouth, I actually want to convey some information or gather some… That probably varies widely between cultures (and individual people and rhe exact social setting). I read some people like to chat with their cashiers while others don’t. And for relationship building we also have body language etc so lots of that doesn’t even need verbal language.