CREATE TABLE table_57500 ("City of license/market" TEXT, "Station" TEXT, "Channel TV  (  RF  ) " TEXT, "Year of affiliation" FLOAT, "Year of disaffiliation" FLOAT)

What is the most recent year of disaffiliation of a CHCH-TV station that affiliated after 2001?
SELECT MAX("Year of disaffiliation") FROM table_57500 WHERE "Station" = 'chch-tv' AND "Year of affiliation" > '2001'
SELECT MAX("Year of disaffiliation") FROM "table_57500" WHERE "Station" = 'chch-tv' AND "Year of affiliation" > '2001'