When the stamp duty reserve tax is 3,669 what is the percentage over gdp?
create table table_1618358_1 (over_gdp__in__percentage_ varchar, stamp_duty_reserve_tax varchar, PRIMARY KEY (over_gdp__in__percentage_))
select over_gdp__in__percentage_ from table_1618358_1 where stamp_duty_reserve_tax = "3,669"