Case ( years employed < 1 ; 0 ;
years employed < 2 ; 10 ;
//and so forth, just continue the pattern
You might also not use any calculation at all. Set up a table of values with this data and use a relationship or ExecuteSQL query to look up the needed values. This has the advantage in that updating the values returned (or the years employed ranges that correspond to that data) becomes data entry task instead of a database design modification task.