CREATE TABLE table_21963 ("Voivodeship after 1569" TEXT, "Capital" TEXT, "Year established" FLOAT, "Number of powiats" TEXT, "Area  ( km\\u00b2 )  in 1590  ( Lithuanian )  Category:Articles with Lithuanian-language external links" FLOAT)

What is the latest year established that had 5 powiats?
SELECT MAX("Year established") FROM table_21963 WHERE "Number of powiats" = '5 powiats'
SELECT MAX("Year established") FROM "table_21963" WHERE "Number of powiats" = '5 powiats'