Population 216. Invaders are on. Goblin civ has a leader, although (after checking in legends, historical maps) I found out they are further away than I originally thought, and there are two elven civs between us that are at war with (and steamrolling) the gobbos. Maybe this has some effect.
To double check you could make a copy of your save or use a backup, abandon the fort then attempt to start a new game on that save. Check the area you embarked on previously using the tab menu to list civilizations. If it has Goblins listed with a set of red dashes next to them then you should be getting visits from them there. If not, that's your problem. They either can't get to you or are otherwise occupied.
On the Civ screen do they have a W or a P next to their listing (first page of Civ screen)?
It has goblins with the red dashes, but it lacks the goblins in the Civ screen... Odd...
If I remember right, I actually didn't have any except my home civ, an ant man civ and an olm man civ there until I got the first caravans from the humans and those pointy-eared folks.
Wait... Why have I not gotten any caravans from the other elven civ whose area my fort is in? It is located on top of an area, ahich belongs to "The Problematic Volcano" AND "The Labyrinthine Embraces", but I haven't gotten any caravans from "The Embraces". Also, according to legends, my civ is not at war with any elves, so that can't be the answer.
Or is it so that I can only get caravans from one elven civ per year?