The value of 2.80% is calculated from:
545900 divided by 803500 + 550700 + 1416800 + 1253200 + 925300 + 886300 + 607600 + 609200 + 652400 + 1593200 + 775500 + 738300 + 689100 + 722200 + 834800 + 1214500 + 826300 + 1519500 + 1204600 + 768600 + 892300 multiplied by 100.
"1 - Total resident population (rounded)" divided by "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" + "1 - Total resident population (rounded)" multiplied by 100.