How many votes did Wales cast when Northern England cast 6?
CREATE TABLE table_15962 (
    "Song" text,
    "Mobiles" real,
    "Northern Ireland" real,
    "Northern England" real,
    "Scotland" real,
    "Southern England" real,
    "Wales" real,
    "Total" real
)
SELECT MIN("Wales") FROM table_15962 WHERE "Northern England" = '6'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many votes did Wales cast when Northern England cast 6? ### Input: CREATE TABLE table_15962 (
    "Song" text,
    "Mobiles" real,
    "Northern Ireland" real,
    "Northern England" real,
    "Scotland" real,
    "Southern England" real,
    "Wales" real,
    "Total" real
) ### Response: SELECT MIN("Wales") FROM table_15962 WHERE "Northern England" = '6'