My eye is not as trained as some but I am gonna also say 16-17%.

That being said. When I was 17% I didn't look NEAR as good as you. Wait... I don't look NEAR as good now! Shit.
You are still moving forward Bro. Still making bigger strides than I am. Makes me feel like I'm slacking.
That first pose you always do is killer! Love the arms and shoulders. You sexy BEAST! lol
Your chest is squaring out. Your shoulders, delts, forearms are really showing more def now to.