How many trade offers a villager can have?

After the Pretty Scary Update, the trade mechanism have changed, villagers can now have multiple number of trade offers after you increase your reputation with them.

This got me wonder how many trade offers a villager can have. I have done some brief research and watched some Pretty Scary Update video review, but haven't found anything on this topic.

So I have tried it out myself in Creative Mode. I have tested it for briefly and so far I have got up to 9 trade offers from a single villager.

Have anyone done any testing about this also?