@misc{eurostat2021population,
  title = {Population: Structure indicators}
  author = {Eurostat},
  url = {https://ec.europa.eu/eurostat/web/main/data/database?p_p_id=NavTreeportletprod_WAR_NavTreeportletprod_INSTANCE_nPqeVbPXRmWQ&p_p_lifecycle=0&p_p_state=normal&p_p_mode=view},
  year = {2021}
}