Table: hk_football_clubs
Columns: club
position_in_2012_13
first_season_in_top_division
number_of_seasons_in_top_division
first_season_of_current_spell_in_top_division
top_division_titles
last_top_division_title

Question: when did the club Citizen achieve its last top division title?
SQL: SELECT "last_top_division_title" FROM hk_football_clubs WHERE "club" = 'Citizen'

Question: How many clubs achieved the 5th position in 2012-13?
SQL: SELECT COUNT("top_division_titles") FROM hk_football_clubs WHERE "position_in_2012_13" = '5th'