Guild Wars 2

Hello every one, I have question for anet.
Can you please tell us how many hp have all bosses in gw2? Like all main bosses in fractal,
dragons and bosses in dungeon? I am very interested in it and I think that not only me It would be nice to know how much they have hp
Thanks for any answer,
Jack

I realy want know this think about boss hp :/ can anyone from anet reply to my topic or pm to me with answer please?
Sorry for double post

Twice as much as when they are at 50% health