Seems to me according to pool stats:
http://pool.coinyeco.in/index.php?page=statistics&action=blocksthat 759 blocks of at least 666 666 coins value each were premined, that gives us 505 999 494 coins premined...
but I dont know if all blocks were 666 666, maybe earlier were even bigger?
Anyway, it gives about 0.38% premine if my calculs are right
Yeah, 666,666 in a block. 0.38% isn't bad. I mean, it's not good but... not enough for me to get buttmad. Fair enough.