April NPD Hardware units:
PS4: (+0.1% YoY)
XBO: (-10.3% YoY)
Wii U: (-24.8% YoY)
360: (-50.6% YoY)
PS3: (-86.8% YoY)
PSTV: (up 100% YoY)
Industry including handhelds: -19% YOY (this may help for calculating Vita numbers?)
We never got Vita numbers last April though. The only thing I think we can conclude from this is that while PSTV is up Vita handheld hardware must be down a bit from what ever it was last year.
Currently I have April 2015 total hardware at ~576,800 (no Vita) and April 2016 total hardware at ~470,900 (not Vita and assuming 3DS is at 75k)
That would be about a 18.36% drop YoY. So in order for all consoles to be down 19% something else must be down and it's probably Vita. Or I'm doing something wrong which is very possible.
PlayStation Vita Japanese Software Sales (Media Create Physical/ Famitsu Digital)