What is the total capacity of venues that opened in 1999?
CREATE TABLE table_5337 (
    "Metro Vincity" text,
    "Venue Location" text,
    "Address" text,
    "Opened" text,
    "Capacity" real
)
SELECT COUNT("Capacity") FROM table_5337 WHERE "Opened" = '1999'
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 total capacity of venues that opened in 1999? ### Input: CREATE TABLE table_5337 (
    "Metro Vincity" text,
    "Venue Location" text,
    "Address" text,
    "Opened" text,
    "Capacity" real
) ### Response: SELECT COUNT("Capacity") FROM table_5337 WHERE "Opened" = '1999'