CREATE TABLE table_name_96 (year NUMBER, venue VARCHAR2, event VARCHAR2, competition VARCHAR2)

How many years had a 100 m hurdles event at the world championships in Osaka, Japan?
SELECT SUM(year) FROM table_name_96 WHERE event = "100 m hurdles" AND competition = "world championships" AND venue = "osaka, japan"
SELECT SUM("year") FROM "table_name_96" WHERE "100 m hurdles" = "event" AND "competition" = "world championships" AND "osaka, japan" = "venue"