The pie charts indicate different percentages of expenditure on seven items in US from 1966 to 1996.
It is obvious that food and cars constituted the largest part of all spending in both years. The highest percentage of expense was in food, at 44% in 1966, but it sharply dropped to 14% in 1996. In contrast, the proportion of expense on cars nearly doubled, rising from 23% to 45% within 30 years.
The proportion of expenditure on computer had a significant rise at the fastest pace, increasing from 1% to 10%. However, the figure about books saw a dramatically downward trend, declining to only 1% in 1996. The figure of restaurant doubled to 14% during 30 years, while petrol and furniture had similar percentages of expense in both years, slightly falling to 8% in 1996.
Overall, more than half of expenditure was still spent on food and cars, although the proportions of other items experienced various changes.