Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_5337 ( "Metro Vincity" text, "Venue Location" text, "Address" text, "Opened" text, "Capacity" real )

### Question ###
What is the total capacity of venues that opened in 1999?

### Accurate SQL ###

SELECT COUNT("Capacity") FROM table_5337 WHERE "Opened" = '1999'