CREATE TABLE table_name_82 (annual_interchanges__millions__2011_12 INT, railway_station VARCHAR)

What's the highest annual interchange for wimbledon railway station?
SELECT MAX(annual_interchanges__millions__2011_12) FROM table_name_82 WHERE railway_station = "wimbledon"
SELECT MAX("annual_interchanges__millions__2011_12") FROM "table_name_82" WHERE "railway_station" = "wimbledon"