CREATE TABLE table_1507806_1 (year INTEGER, runner_up VARCHAR)
SELECT MAX(year) FROM table_1507806_1 WHERE runner_up = "William Mehlhorn"
ปีที่รองชนะเลิศคือ WILLIAM MEHLHORN คือปีอะไร
WHAT WAS THE YEAR WHEN THE RUNNER-UP WAS WILLIAM MEHLHORN?