<p>This information is published annually by the Office of National Statistics, links provided below.</p><p><a href="https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/publicsectorpersonnel/datasets/publicsectoremploymentreferencetable/march2020/datasets.xlsx" target="_blank">(a) March 2020, table 8</a></p><p><a href="https://www.ons.gov.uk/file?uri=/employmentandlabourmarket/peopleinwork/publicsectorpersonnel/datasets/publicsectoremploymentreferencetable/march2016/psereferencetablesmarch2016.xls" target="_blank">(b) March 2016, table 8</a></p><p><a href="https://webarchive.nationalarchives.gov.uk/ukgwa/20150905000144mp_/http:/www.ons.gov.uk/ons/rel/pse/public-sector-employment/q1-2011/stb-q1-2011.pdf" target="_blank">(c) March 2011, table 8</a></p>