In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.

Passage: From October 1985, Kingman was elected Vice-Chancellor of the University of Bristol. He remained in Bristol until 2001 when he took up his post at the Isaac Newton Institute in Cambridge. Shortly after making that move, Kingman drew some media attention for having the third-highest salary among British Vice-Chancellors and this having nearly doubled in his final year in the job, at a time when most academics received pay-rises of about 3%. Whilst at Bristol, he also served in a number of other capacities. In the academic field, he was president of the Royal Statistical Society from 1987 to 1989, and president of the London Mathematical Society from 1990 to 1992. In public service, he was a member of the board of the British Council between 1986 and 1991 and was on the Board of the British Technology Group from 1986 until after it was privatised in 1992. He also held directorships at a number of industrial companies, including IBM from 1985 to 1995 and SmithKline Beecham from 1986 to 1989. In 198788, Kingman chaired the Committee of Inquiry into the teaching of the English language. In 2000 the Chancellor of the Exchequer appointed Sir John the first chairman of the Statistics Commission, the body that oversees the work of the Office for National Statistics, the UK government's statistics agency. In 2002 Kingman attracted some media attention
Link Information: none Answer: none
In the years that John Kingman was president of the Royal Statistical Society versus the years that he was president of the London Mathematical Society, which society had more members?