"As of March 31, Nintendo is reporting that 17.79 Nintendo Switches have been sold -- not shipped, but sold -- worldwide."
http://comicbook.com/gaming/2018/04/26/nintendo-switch-sales-revealed/
Again, That figure of 17.5M is total bullshit. That was from their financial report, not some forum guestimating. Here we are 3 months(roughly) ahead and...yeah.