CREATE TABLE table_name_99 (total INTEGER, silver VARCHAR(255), nation VARCHAR(255), bronze VARCHAR(255), gold VARCHAR(255))
what is the average total when bronze is more than 0, gold is 0, the nation is united states (usa) and silver is 0?
    
SQL: SELECT AVG(total) FROM table_name_99 WHERE bronze > 0 AND gold = 0 AND nation = "united states (usa)" AND silver < 0