The source for this indicator is National Statistics Annual Population Survey. The small sample size at local authority level means that large swings can be partially attributed to sampling variability and therefore large year on year changes should be interpreted with caution. The 2017/18 figure appears to be unrepresentatively low. However taking account of the confidence level in the data of +/- 1.5 at the upper end would be consistent with a long term improving trend in this data over the past five years from 9.1% in 2016 down to 5.5% in 2020.
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