SELECT year FROM table_name_90 WHERE type_of_vehicle = "open wheel" AND racing_series = "formula one" AND nation_of_citizenship = "germany"
Tahun berapa kendaraan roda terbuka dan serangkaian balap Formula Satu dengan negara kewarganegaraan di Jerman.
CREATE TABLE table_name_90 (year VARCHAR, nation_of_citizenship VARCHAR, type_of_vehicle VARCHAR, racing_series VARCHAR)