In the case of statistics on the structure and distribution of earnings, information shall be provided at least on: ... (c) the following details of earnings:
- gross earnings for a representative month (distinguishing separately earnings related to overtime and special payments for shift work),
- gross annual earnings in the reference year (distinguishing separately bonuses paid irregularly),
- working-time (the number of hours paid in a standard working month, the number of overtime hours paid in the month and the annual leave entitlement).
