Count and IN Clause Issue

Count and IN Clause Issue

I have a table named as employee history and its structure is as follows.
tbl_employee_history Structure id|history_nr|history_value|employee_id 1
82 83 1 2 86 84 1 3 87 85 1 4 603 1 5 82 83 2 6 86 83 2 7 87 83 2 8 603 83
2
This is the dummy data for my table. Now I want to count all those
employees whose history_nr is in 82,86,87,603 AND history_value should not
be empty like in the above example the count should be 1 as for employee
id 2 all the values are not empty. This is my query for implementing the
count.
SELECT count(employee_id) FROM tbl_employee_history where history_nr
IN(82,86,87,603) AND history_value!=''
But what happens is the count returns me two values. Thanks in advance.