Discrepancy in number of deportations

IN the context of the recent brouhaha over Nigerian deportations, your readers might like to reflect on the following:

Nigerians have, for some years, constituted around 40% of asylum applications and one might reasonably expect them to constitute about 40% of deportations.

Instead, over the past few years they have constituted under 10% of them. Over a three-year period, the numbers were 46, 22 and 77.