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Published 16:56 2 Aug 2016 BST

The likely drop-off is not the only thing that pre-Rio studies have discovered, however.
MyVoucherCodes have looked back at the modern era and learned that just 9% of British medal-winners have been female.
The balance was restored somewhat in 2012, with 11 of the 29 British golds going to individual women or teams containing at least one woman.
Jessica Ennis-Hill and Laura Trott are among the female competitors looking to pick up another gold in Rio to add to their London achievements.
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