199k > 174k (-12%)
It is not a big drop off... if you thing PS4 is yet the same price since launch it looks like a ok drop.
I guess the real question is "why Xbone increased sales?"
Gamestop: up to $125 trade-in PS360 for Xbone for all April
Bestbuy: up to $175 trade-in PS360 for Xbone for last week of April