71% YoY decline: http://www.idc.com/getdoc.jsp?containerId=prUS41996116

The problem with YoY compares is the Apple Watch was on an 18 month update cycle. YoY makes sense for something that isn't regularly updated, or that updates every 12 months.

Disputed

Likely http://www.pcworld.com/article/230151/idc_windows_phones_to_...

https://news.ycombinator.com/item?id=13118890

That was some great piece of analysis :)