user: Question: What is the latest year established that had 5 powiats?
Columns: ['Voivodeship after 1569', 'Capital', 'Year established', 'Number of powiats', 'Area (km²) in 1590 (Lithuanian) Category:Articles with Lithuanian-language external links']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Brest Litovsk Voivodeship', 'Brest', 1566.0, '2 powiats', 40600.0]
SQL:

assistant: SELECT MAX("Year established") FROM "Table" WHERE "Number of powiats" = '5 powiats';