CREATE TABLE table_63769 ("Coaster Name" CLOB, "Park" CLOB, "Location" CLOB, "Track" CLOB, "Builder" CLOB, "Year Opened" CLOB)

Which year opened is located in west mifflin, pennsylvania?
SELECT "Year Opened" FROM table_63769 WHERE "Location" = 'west mifflin, pennsylvania'
SELECT "Year Opened" FROM "table_63769" WHERE "Location" = 'west mifflin, pennsylvania'