I think the "trend" for Germany is right. But the particularly low numbers in this poll (done in spring 2005) might be related to a whole bunch of honour killings during that time in Germany.

According to a "Die Zeit" article (in German), there were five honour killings in Berlin alone during the four months before that article was published. The one most widely published (and making it number 6) was the murder of "Hatun Sürücu" in February 2005.

That shocked a lot of Germans. Especially after reading in newspapers that a school principal had overheard three pupils of Turkish origin justifying the murder afterwards by saying that she had lived like a "German".

In the aftermath of that murder, the media for the first time wrote about honour killings, forced marriages and so on. Leaving a lot of Germans with a distinctly uneasy feeling.