user: Question: How many years had a 100 m hurdles event at the world championships in osaka, japan?
Columns: ['Year', 'Competition', 'Venue', 'Position', 'Event']
Types: ['real', 'text', 'text', 'text', 'text']
Sample row: [2006.0, 'African Championships', 'Bambous , Mauritius', '1st', '100 m hurdles']
SQL:

assistant: SELECT COUNT("Year") FROM "Table" WHERE "Event" = '100 m hurdles' AND "Competition" = 'world championships' AND "Venue" = 'osaka, japan';