The census collectors are not remotely interested in your employment history as an individual. As soon as the form gets back to the office or you click 'send' on your computer your personal details become an anonymous set of numbers added to millions of others and analysed in bulk.
The first time your personal data is likely to see the light will be in 100 years time when the detailed figures are released. By which time you, the census enumerator, and anyone dealing it will be long dead. It will be accessed by a grand child or great grandchild, and if you have no descendants probably will never be accessed.
Why do they want the data? They need it for a variety of analysis for emploment statistics needed in planning, where people worked, what industries they worked in, whether their employment moved them round the country, the speed of decline in some industries, the rapid growth of people in new industries.
These figures and analysis then feed into housing planning, health planning, education planning, transport planning and all the unconsidered trifles of everyday life.
In a previous life I ran a regional market research department in a public utility and the company ran a huge national survey of household energy consumption every couple of years. We asked questions about every single heating source in every room and details of every single domestic appliance in the property and basic details of members of the household.
These details were turned to numbers in a computer and gave us really useful information about heating trends, ownership of appliances that drove long term energy planning.
I cannot tell you how profoundly uninterested we were in any individual person's data. What could one form tell us about the growth of cwntral heating or the purchase of combi boilers or central heating servicing contracts? Nothing at all. but the data from 10,000 forms all added up were really informative.
I know we all feel that information about ourselves is going to be of great interest to someone when we complete a survey, I do as much as any, even though I know how, the chances of anyone ever reading the form, other than to enter the data on it at speed into a computer,is as close to nil as is possible. They probably do not even enter name details. You will just be reduced to 'male, age 72, living alone, 5 jobs, dates and industries.' Or whatever your information is.
Then in 100 years time a great grandchild, will be excited to find that they had a great grandfather who started as a coal miner and ended up an astronaut.