is this a writing technique

why does the writer use "one fifth" rather than percentage of 20% to go with the rest of the paragraph?  is it to trick the reader?

http://www.economist.com/node/21526350 

A lot of Asians are not marrying later. They are not marrying at all. Almost a third of Japanese women in their early 30s are unmarried; probably half of those will always be. Over one-fifth of Taiwanese women in their late 30s are single; most will never marry. In some places, rates of non-marriage are especially striking: in Bangkok, 20% of 40-44-year old women are not married; in Tokyo, 21%; among university graduates of that age in Singapore, 27%. So far, the trend has not affected Asia’s two giants, China and India. But it is likely to, as the economic factors that have driven it elsewhere in Asia sweep through those two countries as well; and its consequences will be exacerbated by the sex-selective abortion practised for a generation there. By 2050, there will be 60m more men of marriageable age than women in China and India.

 

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