Income share isn't actually a good indicator of anything on its own. One would at the very least need to provide some sort of inflation chart and some sort of equivalent to a consumer price index. Like, it wouldn't mean much if they all had the same income if that income couldn't buy bread for example. not saying that was or was not the case, just using an example of how the given charts are meaningless on their own. That you provided them without even trying to provide context means you're unaware of this and are ignorant to the issue or you're actively misleading people.