O que era o Fim quando a Liga Nacional era a Liga, a percentagem era inferior a 0,726, o ano era maior que 1897, e as franquias eram os Piratas de Pittsburgh?
CREATE TABLE table_name_22 (finish VARCHAR, franchise VARCHAR, year VARCHAR, league VARCHAR, percentage VARCHAR)
SELECT finish FROM table_name_22 WHERE league = "nl" AND percentage < 0.726 AND year > 1897 AND franchise = "pittsburgh pirates"