CREATE TABLE table_75227 ("Year" FLOAT, "Class" TEXT, "Team" TEXT, "Machine" TEXT, "Points" FLOAT, "Rank" TEXT, "Wins" FLOAT)

Which year had a team of Aprilia and a rank of 4th?
SELECT "Year" FROM table_75227 WHERE "Team" = 'aprilia' AND "Rank" = '4th'
SELECT "Year" FROM "table_75227" WHERE "Rank" = '4th' AND "Team" = 'aprilia'