Write SQL query to solve given problem: What is the percentage of coaches in 1969 who were awarded "NBA Coach of the Year"?. Keep the solution inside sql tag ```sql [SQL-Query] ```
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