PS4 Hardware Sales 2015 vs 2016 vs 2017: New Years numbers posted. 2017 ends at 20.2 million

[PAOerfulone]

Now that the first week numbers of 2018 have come in, I have officially started a brand new thread centered around that: http://gamrconnect.vgchartz.com/thread.php?id=234574 Therefore, I would like to ask the Mods to please lock this thread. Thereby, concluding this chapter of the PS4's life cycle and beginning a new one.