Table schema:
CREATE TABLE table_name_18 (year_s__won VARCHAR, country VARCHAR, to_par VARCHAR, total VARCHAR)

Question: Can you tell me the Year(s) Won that has the To par larger than 5, and the Total smaller than 155, and the Country of united states?
SQL: SELECT year_s__won FROM table_name_18 WHERE to_par > 5 AND total < 155 AND country = "united states"