What is the average rank of a nation that had 219,721 in 2012?
CREATE TABLE table_39412 (
    "Rank" real,
    "Country" text,
    "2011" real,
    "2012" real,
    "2013(Jan\u2013Sep)Link" text
)
SELECT AVG("Rank") FROM table_39412 WHERE "2012" = '219,721'
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: What is the average rank of a nation that had 219,721 in 2012? ### Input: CREATE TABLE table_39412 (
    "Rank" real,
    "Country" text,
    "2011" real,
    "2012" real,
    "2013(Jan\u2013Sep)Link" text
) ### Response: SELECT AVG("Rank") FROM table_39412 WHERE "2012" = '219,721'