The population counts (the denominators) are estimates based on the 2011 England and Wales Census.
Claimant figures used are the average number of claimants per month in each year. (Mid-year or end-year counts would give different percentages because of fluctuations in the JSA claimant count across the year.)
The number of people claiming JSA has been drawn from administrative datasets held by the Department for Work and Pensions. JSA claimant counts are published monthly.
JSA claimant counts are rounded to the nearest 5. Percentages are rounded to the nearest 0.1%.