It was a completely valid and relevant question.
Without any comparisons, your declaration that Ipsos got 17% is absolutely meaningless.
I'm not sure why my question bothered you so. The only possible assumption would be that Ipsos did better than the other polling companies. Cool.
If YOU want to know the answer, YOU can do the research.
Do it! Do it now! Schnell!
I don't, and I won't.
The 17% accuracy of THAT Ipsos poll was sufficiently noteworthy that it was posted on wikipedia. The comparison of several public opinion polls from years ago is irrelevant to me.
I also don't care about the accuracy of the weather forecast for October 19, 1983.