This coin was launched in the summer right? It states 160mil coins in the 1st year, why didn't it state the first 6 month?
When a coin is mined if the dif doesn't adjust fast enough, block times get smaller. So if the target was 2 min but dif didn't adjust fast enough block times went all the way down to 10 seconds. You see this in btc too, like when a pool gets 5-6 blocks in a row all within a min or two.
So no dev can predict exactly how many blocks will be mined unless the dif adjust every block..which gets nasty.
And for ZET, it was released and many asics hit it hard the first day. :-)~