Table schema:
CREATE TABLE table_name_53 (partial_failures INTEGER, launches VARCHAR, family VARCHAR, country VARCHAR, failures VARCHAR)

Question: What is the partial failure for the Country of russia, and a Failure larger than 0, and a Family of angara, and a Launch larger than 1?
SQL: SELECT AVG(partial_failures) FROM table_name_53 WHERE country = "russia" AND failures > 0 AND family = "angara" AND launches > 1