How many Men's 200 Metres Freestyle events did Ian James Thorpe compete in?
Men's 200 Metres Freestyle events refer to event_name = 'Swimming Men''s 200 metres Freestyle'; events compete in refers to event_id;
SELECT COUNT(T1.id) FROM person AS T1 INNER JOIN games_competitor AS T2 ON T1.id = T2.person_id INNER JOIN competitor_event AS T3 ON T2.id = T3.competitor_id INNER JOIN event AS T4 ON T3.event_id = T4.id WHERE T1.full_name = 'Ian James Thorpe' AND T4.event_name LIKE 'Swimming Men%s 200 metres Freestyle'