1- average number of vehicles DRIVEN ON three different roads over THE 10-year period
2 - the number of prisonerS in five countries over THE 60-year periord
3 - the amount SPENT ON COMSUMER GOODS in 3 different countries IN THE CATEGORIES OF ToyS, CDs, Perfumes....
4 - A comparison of THE number OF men and women BY DIFFERING levels of post [NEED A TYPE OF SCHOOL HERE; HIGH SCHOOL, COLLEGE, GRADUATE SCHOOLD etc] EDUCATION (although qualification is grammatically and definitionally correct, it would not be commonly used)
5 - the number of PEOPLE aged (aged is okay but not necessary) 65. OR... the POPULATION OF PEOPLE 65 and over