19, if you were lucky enough to build a maypole while they were available. Summer event I believe.

Then there's the yule (Christmas) tree, which isn't yet buildable or on the map but can be added with dev commands.

The update is:

Blackwood table (either) are better than normal table.

Adding crystal windows (don't know how this works, think it just needs one placing within 10m)

Hottub, which must be fuelled.

That's it I think from the update.