What is the average end year of the player from swe and a summer transfer window?
CREATE TABLE table_61183 (
    "Nat." text,
    "Name" text,
    "Moving from" text,
    "Type" text,
    "Transfer window" text,
    "Ends" real,
    "Transfer fee" text,
    "Source" text
)
SELECT AVG("Ends") FROM table_61183 WHERE "Nat." = 'swe' AND "Transfer window" = 'summer'
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 end year of the player from swe and a summer transfer window? ### Input: CREATE TABLE table_61183 (
    "Nat." text,
    "Name" text,
    "Moving from" text,
    "Type" text,
    "Transfer window" text,
    "Ends" real,
    "Transfer fee" text,
    "Source" text
) ### Response: SELECT AVG("Ends") FROM table_61183 WHERE "Nat." = 'swe' AND "Transfer window" = 'summer'