Asterisk Telephony: Executive vs Basic Telephone Ratio

Hi there, I am preparing a study analysis on Asterisk and while doing it, I came across this query: What is the ratio of Executive IP Phones to Basic IP Phones when it comes to Asterisk Deployment?

I have been in IP Telephony industry for 5+ years but unfortunately not exactly with Asterisk. In Proprietary deployment, I have seen a rough figure of 1:5 for Executive to Basic ratio. What about Open Source environments?