Generally, I think it can be calculated as a percentage, though length of time is also valid - http://en.wikipedia.org/w/index.php?title=Turnover_%28employment%

Generally, I think it can be calculated as a percentage, though length of time is also valid - http://en.wikipedia.org/w/index.php?title=Turnover_%28employment%29#Calculation http://en.wikipedia.org/w/index.php?title=Turnover_%28employ...