That's their figures. Most come from countries that don't do inches. I'm calling an algorithm deviance complexity of 9.2% across the lot. You know it makes sense...
http://scholar.google.com/scholar?q=...ed=0CCkQgQMwAA
Mmmm-hmm
I just came across this thread, which was put up by a poster who seems to have been absent for a long time.