Numbers of the year

A guide to 2013 in numbers - the most informative, interesting and idiosyncratic statistics of the year discussed by More or Less interviewees. Contributors: David Spiegelhalter, Winton professor for the public understanding of risk at Cambridge University; Linda Yueh, BBC chief business correspondent; Simon Singh, author of The Simpsons and Their Mathematical Secrets; Dr Pippa Malmgren, president and founder of Principalis Asset Management; Paul Lewis; presenter of BBC Radio 4's Money Box programme; Dr Hannah Fry, Centre of the Advanced Spatial Analysis at University College London; Merryn Somerset-Webb, editor-in-chief of MoneyWeek; Helen Arney, comedian. Producer: Ben Carter.