Table schema:
CREATE TABLE table_1618358_1 (stamp_duty_reserve_tax VARCHAR, over_total_tax_revenue__in__percentage_ VARCHAR)

Question: What is the stamp duty reserve tax when the percentage over total tax revenue is 0.79?
SQL: SELECT stamp_duty_reserve_tax FROM table_1618358_1 WHERE over_total_tax_revenue__in__percentage_ = "0.79"