CENSUS TIME! *does a very nerdy dance* STATISTICS! Historical data!
Or, as my housemate puts it: The whole country makes a primary source. AT THE SAME TIME.
Also, I when filling out the endless job questions (occupation: tertiary teacher. Tasks: teaching tertiary students. Employer’s business: tertiary education) I did not declare that the main goods or products of my employer are ‘wankers’. I was sorely tempted, but my respect for historical data restrained me.
Also, speaking of government forms, e-tax pre-filling is the best invention ever, and I love the fact that my scholarship doesn’t count as income.