What is the percentage of coaches in 1969 who were awarded "NBA Coach of the Year"?
in 1969 refers to year = 1969; awarded "NBA Coach of the Year" refers to award = 'NBA Coach of the Year'; percentage = divide(count(coachID where year = 1969 and award = 'NBA Coach of the Year'), count(coachID)) * 100%
SELECT CAST(SUM(CASE WHEN award = 'NBA Coach of the Year' THEN 1 ELSE 0 END) AS REAL) * 100 / COUNT(*) FROM awards_coaches WHERE year = 1969