The chart below illustrates the percentages of sales of one bookseller in 1970, 1997 and 2012. Summarize the information by selecting and reporting the main features, and make comparisons where relevant.

The illustrations demonstrate the proportion of books sold by different sorts between 1972 and 2012.

Overall

, there was an increase in the percentage of

adult

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adults

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and children sorts,

while

the opposite was true for the data

of

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on

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biography,

traveling

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travelling

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, and other genres.

Additionally

, the mean of other types of books stayed at the highest position before being replaced by adult fiction from 1992 onwards. The proportion of adult novels started at 20% in 1972, after which it experienced a slight growth to 25% in 1992, before ending the period at 45%

due to

a significant rise, which was double that of the figure for the first

year

. Similar changes but with

smaller

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a smaller

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extent could be seen in the sales of

children

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children's

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fictions

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fiction

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, which was at 20% in 1972, followed by a minute climb to 22% after two decades, and ended at 25% in the final

year

. 25% was the sale of other kinds of books in the first

year

of the time, with a marginal decrease to 20% in the next twenty years and a final remarkable drop to 12% in 2012. (...) The figures for

traveling

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travelling

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and biography genres saw equivalent changes, starting at 15% and 20% in 1972, reaching 10% and 8% in the final

year

respectively, despite a small rise of travel novels to 18% in 1992.