;2016;2016;2017;2017; Total basis for employer's National insurance contributions;Calculated employer's National insurance contributions;Total basis for employer's National insurance contributions;Calculated employer's National insurance contributions; Both private and public sector;1243908;162067;1279937;166453; Public sector;338852;42349;351976;43928; Private sector;905058;119717;927960;122525; Zone 1;773289;0;790905;0; Zone 1a;18516;0;18793;0; Zone 2;36038;0;37048;0; Zone 3;10333;0;10806;0; Zone 4;36180;0;38387;0; Zone 4a;18465;0;19409;0; Zone 5;11520;0;12128;0;