Table schema:
CREATE TABLE table_name_8 (killeen_rate INTEGER, crime VARCHAR, texas_rate VARCHAR, reported_offenses VARCHAR, us_rate VARCHAR)

Question: Reported Offenses larger than 216, and a U.S. Rate smaller than 3274, and a Texas Rate smaller than 2688.9, and a Crime of violent crime has what killeen rate?
SQL: SELECT SUM(killeen_rate) FROM table_name_8 WHERE reported_offenses > 216 AND us_rate < 3274 AND texas_rate < 2688.9 AND crime = "violent crime"