Why doesn't the trigger work on Excel Import?

Question

SQL Server

Can you please tell me if it is possible for the trigger to work when importing from Excel?
There is a trigger on after insert. It works if you add records manually, but for some reason it doesn't work when importing...
Here is my code:

alter trigger ForInsertEmpl on dbo.Employees
after insert
as
begin
    update e set EmpCenterId = 
    (select emp.Id from EmploymentCenter emp where emp.BIN = e.BIN) 
    from Employees e
    where e.Id in (select Id from inserted);
end

What can be done?

Answer 1

If bcp is used for the import, here is the quote from msdn :
FIRE_TRIGGERS
Applied along with the in argument, it specifies that Insert triggers defined on the target table will run during the bulk copy operation. If the FIRE_TRIGGERS parameter is not specified, Insert triggers will not be executed. The FIRE_TRIGGERS option for the out, queryout, and format arguments is ignored.