@misc{pension-provision-in-numbers,
  title   = {Old-age Provision Statistics},
  author  = {Leimgruber, Matthieu and Käser, Elsa and Hartmann, Lukas},
  year    = {2026},
  month   = {jul},
  url     = {https://www.historyofsocialsecurity.ch/articles/history-of-social-security-numbers/pension-provision-in-numbers}
}