Link to the report
http://feed.ne.cision.com/wpyfs/00/00/00/00/00/16/73/EA/wkr0006.pdf
Guess that google translate can do the work but as it is a PDF it might be tricky.
I might have some lack of mathematical skills but still it is a high rate of failures for Porsche cars. And I guarantee, most of them are really babied for during wintertime due to the even higher premium pricing we have in Sweden compared to US. Also when it comes to driving errors I do think that we as Porsche drivers see ourselves as slightly more interested in our cars than the average Toyota owner which means that we do probably check the oil better/ more often than average driver etc.