According to ISIS they have 2.5 (inc one born in last 12 months) but not sure how out of date it is.
The gap in the boards is obviously the daughter that was sent to Europe. I am not sure if there has been only one more birth(to Bibundi, I saw a new baby last year) since Afi, or whether the remaining older daughter has had a baby too since then (inbreeeding).
I wonder why the orginal zoo in Germany called the breeding male Gorbi ? i was thinking perhaps that it might be because of memories of Gorbachev ,the wall , and east berlin , just a thought