 The density changes a lot from one census to another but that was also down the change of map boundaries.Even when the first census was produced it categorised into three categories, 'chiefly employed in agriculture', those 'chiefly employed in trade, manufacturers or handicraft', and 'others'.However, as time went on the censuses became more detailed, data was collected on people's occupations and were then used in the 1841 census whereby there was over 3,000 different occupational titles.