Source of Anthropometric Data in Ergonomics Manakin Editor

Hi!

I am currently working whith Ergonomic Evaluation and I need to know the source of the anthropometric data for the german 50th percentile male/female. 

Sadly I was not able to find this information in the user assistance or on the website. 

If someone could point me into the right direction or even give me the exact norm these data comes from, I would greatly appreciate it.

Greetings

Viktoria Adams