The plant is now fifty years old and celebrated as they do with the original Viva model and the current Astra.
It was built on a disused WWII airfield to supply other UK factories with subassemblies and engines. However, the Viva HA model started to be made there in 1964. By 1975 all Chevettes were manufactured at Ellesmere Port and in 1980 the first Opel badged cars were produced - to go to Germany. In 1981 the Astra model was introduced. In 2005, EP passed the 4,000,000 mark for cars produced.
In recent times GM has been trying to refine its European operations to make them profitable and that meant less factories. Ellesmere Port was a possible casualty but it has been given the green light for the 2015 Astra to be made there along with the Gliwice plant in Poland. They will be the only factories making that model.
I have put together a series of a lists below, in ten year increments of EP production numbers. Ones that are estimates are rounded. As to why manufacturers do not put this sort of thing out in the public domain I do not know. Anyway, it is very close to exact but has various sources and is not absolute in accuracy. It could depend whether the source included the van variant of the car, or just counted passenger cars.