Table schema:
CREATE TABLE table_18143210_2 (number_of_seasons_in_liga_mx VARCHAR, first_season_of_current_spell_in_top_division VARCHAR)

Question: How many 'number of season in Liga MX' were played if the 'first season of current spell in top division' is in 1962-63?
SQL: SELECT number_of_seasons_in_liga_mx FROM table_18143210_2 WHERE first_season_of_current_spell_in_top_division = "1962-63"