CREATE TABLE table_name_91 (area_1996_km² INTEGER, pop_1999 VARCHAR(255), area_2006_km² VARCHAR(255))
Which area 1996 km² has a pop 1999 of 17,510, and an area 2006 km² larger than 30?
    
SQL: SELECT MAX(area_1996_km²) FROM table_name_91 WHERE pop_1999 = "17,510" AND area_2006_km² > 30