Table: north_melbourne_football_club
Columns: year
w_l_d
position
chairman
ceo
coach
captain
vice_captain
best_and_fairest
leading_goalkicker

Question: How many years was their W/L/D record 13:10:0?
SQL: SELECT COUNT("chairman") FROM north_melbourne_football_club WHERE "w_l_d" = '13:10:0'