data. With a graph like this, it is easy to spot the times of high unemployment and of low unemployment.

Pie Graphs

A pie graph (sometimes called a pie chart) is used to show how an overall total is divided into parts. A circle
represents a group as a whole. The slices of this circular “pie” show the relative sizes of subgroups.

Figure A6 shows how the U.S. population was divided among children, working age adults, and the elderly in

1970, 2000, and what is projected for 2030. The information is first conveyed with numbers in Table A4, and

then in three pie charts. The first column of Table A4 shows the total U.S. population for each of the three

years. Columns 2–4 categorize the total in terms of age groups—from birth to 18 years, from 19 to 64 years, and

65 years and above. In columns 2–4, the first number shows the actual number of people in each age category,

while the number in parentheses shows the percentage of the total population comprised by that age group.
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