You are quite correct, I misunderstood the graph.
20% of UK born people vs 20% of foreign born people (rounding up) would give vastly different numbers.
So for example
(these numbers are chosen for ease of maths by me and are not actual representations)
20% of 50 million UK born citizens = 10 million.
20% of 1 million Foreign born citizens = 200 thousand.
So yes you are correct. I misunderstood the graph and I cannot state that half of social housing is lived in by Foreign born citizens
.
However I can stand by the notion that if even only 1% of annual immigration (annual immigration was 230,000 from June 2016 - June 2017) is now renting in social housing, then we need to build a certain amount of new social housing to accomodate this population increase.
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