Question: How many top division titles were won during the 'first season of current spell in top division' in 1979-80?
Schema: create table table_18143210_2 (top_division_titles varchar, first_season_of_current_spell_in_top_division varchar, PRIMARY KEY (top_division_titles))
SQL: select top_division_titles from table_18143210_2 where first_season_of_current_spell_in_top_division = "1979-80"