@misc{supplementary-ahviv-benefits-in-numbers,
  title   = {Supplementary Benefits Statistics},
  author  = {Leimgruber, Matthieu},
  year    = {2026},
  month   = {jul},
  url     = {https://www.historyofsocialsecurity.ch/articles/history-of-social-security-numbers/supplementary-ahviv-benefits-in-numbers}
}