The pie charts below show the percentage of five kinds of books sold by a booksellere between 1972 and 2012

The given pie graphs represent the proportion of five book genres' market shares in a supplier from 1972 to 2012.

Overall

, adult

fiction

became the most significant area sold by a bookstore by far over time, children's

fiction

also

increased its size whilst all other categories lost market share. The three biggest

interested

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interesting

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reading categories were adult

fiction

, children's

fiction

and biography, with 20% for each in 1972.

However

,

whilest

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while

adult

fiction

and children's

fiction

rose their total revenues to 45% and 25%, respectively, biography saw a notable decrease

by

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of

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5% in 1992,and 7% in 2012 to 8% in 2012.

Therefore

, the proportion of biography sales hit the bottom and placed the

last

rank. Travel and other categories that

not

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were not

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mentioned were the remaining two competitors which had 40% of the total sales in 1972. Travel books share dropped by 5% to 10% in 2012,

although

slight

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slightly

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increased by 3% in 1992. The others more than

a

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apply

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half of incomes

lost

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were lost

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and dropped to %12 in 2012.