CREATE TABLE table_36008 ("Year" FLOAT, "Competition" TEXT, "Venue" TEXT, "Position" TEXT, "Notes" TEXT)

What Notes after 1983 have a Position of 18th?
SELECT "Notes" FROM table_36008 WHERE "Year" > '1983' AND "Position" = '18th'
SELECT "Notes" FROM "table_36008" WHERE "Position" = '18th' AND "Year" > '1983'