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London Fixed Gear and Single-Speed is a community of predominantly fixed gear and single-speed cyclists in and around London, UK.
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christianSpaceman
It was 8.4% in 1970 https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&ved=0ahUKEwiMpui_rrjVAhVlCcAKHd3JBnsQFggoMAA&url=http%3A%2F%2Fresearchbriefings.files.parliament.uk%2Fdocuments%2FSN04252%2FSN04252.pdf&usg=AFQjCNEhZJMFMwni-zEsyN5sg_4UgnTe1A (bottom of page 14)