The graphs show changes in spending habits of people in the UK between 1971 and 2001.

The pie charts compare Americans' expenditure in 7 different categories namely food, cars, petrol, restaurants, furniture, computers and books in 1966 with that of 1996. Overall, the least significant percentage of spending by Americans went on computers in 1966 while the food cost them the highest percentage.
The pie charts compare how Americans spent on different commodities in 1996 with that of 1966. The expenses are given as percentages and it is obvious that cars consumed the highest percentages of American citizens’ expenditure in 1996 while it was food that required the highest ratio of money in 1966.