Each olympiad has two papers of 5 questions, except for the first year which had a total of 15 questions. The first competition was held in 1988, giving 165 problems to date. Many thanks to Finbarr Holland for providing the questions for 1988-1992 and 2002-3. The years 1989-2001 have been on the web for some years.
The problems I have solved seem similar in difficulty to the Australian or Canadian olympiads.
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