The company mentions GRI indicator G4-LA1 New employee hires and employee turnover - (see p. 133 of the report):

 

"The turnover rate at individual international locations is recorded, but not consolidated at the BMW Group level. This indicator is not fully reported because it is not possible with the current system to break down the absolute and percentage values for employee hires and resignations by region and gender. We plan to integrate this indicator in our data collection process by 2018."

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Additional information found on p. 70:

 

Employee attrition rate BMW AG (number of employees on unlimited employment contracts leaving the company):

 

2015: 2.08 % of the workforce

2014: 1.41 % of the workforce

2013: 3.47 % of the workforce

2012: 3.87 % of the workforce

2011: 2.16 % of the workforce