The financial year 2017 (ending 31 March 2018) has been a good one for Sony, as the company records profits reaching $6.7 billion from revenues worth $78.1bn-- in good part thanks to the success of the PlayStation 4.
PS4 sales for fiscal 2017 total 19 million units, a decline from the 20m sold in fiscal 2016. However, one has to keep in mind the PS4 is fast approaching its 5th birthday, and such sales still outnumber those of other game consoles. The Nintendo Switch comes closest, with 17.79m units sold since March 2017. As for lifetime sales, the global PS4 install base totals 76m, far beyond the 30-50m lifetime sales estimate of Xbox hardware sales (Microsoft does not detail actual Xbox numbers in its financial reports).