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Employee-related expenditure - Number of employees (Details) - employee
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2017
Number and average number of employees      
Permanent employees 31,112 31,020 30,600
Non-permanent employees 317 250 300
Total number of employees 31,429 31,270 30,900
Mining      
Number and average number of employees      
Total number of employees 7,402 7,471 7,483
Exploration And Production International      
Number and average number of employees      
Total number of employees 419 430 416
Energy      
Number and average number of employees      
Total number of employees 5,118 5,069 5,008
Base Chemicals      
Number and average number of employees      
Total number of employees 8,090 7,724 7,438
Performance Chemicals      
Number and average number of employees      
Total number of employees 5,667 5,600 5,435
Group Functions      
Number and average number of employees      
Total number of employees 4,733 4,976 5,120