CREATE TABLE table_203_729 (id DECIMAL, "township" TEXT, "fips" DECIMAL, "population\ center" TEXT, "population" DECIMAL, "population\ density\ /km2  ( /sq mi ) " TEXT, "land area\ km2  ( sq mi ) " TEXT, "water area\ km2  ( sq mi ) " TEXT, "water %" TEXT, "geographic coordinates" TEXT)

what is the only population center in the green garden township ?
SELECT "population\ncenter" FROM table_203_729 WHERE "township" = 'green garden'
SELECT "population\ncenter" FROM "table_203_729" WHERE "township" = 'green garden'