The metric type "1952 - Age 45 to 59 - percentage of ONS population count" value of 20.5 % for area East Sussex (County) 2011 is calculated from:
107,981 divided by 526,671 multiplied by 100.00
"1934 - Age 45 to 59" divided by "1798 - Number of all usual residents" multiplied by 100.00