Table: pole_vault_records_2
Columns: record
athlete
nation
venue
date

Question: What is the Nation with a Date that is may 6, 1991?
SQL: SELECT "nation" FROM pole_vault_records_2 WHERE "date" = 'may 6, 1991'

Question: What is the Record with a Date that is may 20, 1961?
SQL: SELECT "record" FROM pole_vault_records_2 WHERE "date" = 'may 20, 1961'