How were 2017 numbers by comparison? Because I expect the gap between PS4 and the rest to have been even larger in 2017 than in 2018.

Edit: According to a post in the link, Switch total sales are at 730K, meaning Switch sold 340K last year, so an almost 15% increase over last year.

Here's the post in question, with totals for all platforms, even older ones:

PS3 - 3,000,000 
PS4 - 2,900,000 
PSP - 2,400,000 
PS Vita - 700,000 Approx 

NDS - 4,500,000 
3DS - 2,100,000 Approx 
Wii - 2,800,000 
WiiU - Approx. 250,000 
Switch - 730,000 

Xbox 360 - 1,150,000 
Xbox One - 378,000

Last edited by Bofferbrauer2 - on 24 January 2019