CREATE TABLE table_name_30 (Id VARCHAR2)

What is 2000, when 1996 is 'A', when 1997 is 'A', and when 2007 is 'A'?
SELECT 2000 FROM table_name_30 WHERE 1996 = "a" AND 1997 = "a" AND 2007 = "a"
SELECT 2000 FROM "table_name_30" WHERE "a" = 1996 AND "a" = 1997 AND "a" = 2007