CREATE TABLE table_name_90 (year VARCHAR(255), nation_of_citizenship VARCHAR(255), type_of_vehicle VARCHAR(255), racing_series VARCHAR(255))
What year has the vehicle of open wheel and a racing series of formula one with a Nation of citizenship in Germany.
    
SQL: SELECT year FROM table_name_90 WHERE type_of_vehicle = "open wheel" AND racing_series = "formula one" AND nation_of_citizenship = "germany"