user: Question: How many 'number of seasons in top division' were played if the 'first season in top division' games is in 1990-91?
Columns: ['Club', 'First season in top division', 'Number of seasons in top division', 'First season of current spell in top division', 'Number of seasons in Liga MX', 'Top division titles']
Types: ['text', 'text', 'real', 'text', 'real', 'real']
Sample row: ['América', '1943-44', 89.0, '1943-44', 89.0, 11.0]
SQL:

assistant: SELECT SUM("Number of seasons in top division") FROM "Table" WHERE "First season in top division" = '1990-91';