[Excerpt] The Pension Benefit Guaranty Corporation (PBGC) was established by the Employee Retirement Income Security Act of 1974 (ERISA) to ensure that participants in defined benefit pension plans receive their pensions if their plans terminate without sufficient assets to pay promised benefits. The PBGC administers separate insurance programs to protect participants in single-employer and multiemployer plans. The PBGC has published the Pension Insurance Data Book annually since 1996 to present detailed statistics on PBGC program operations and benefit protections. This edition of the Pension Insurance Data Book contains one short article describing the characteristics of PBGC’s Multiemployer Insurance Program. The tables in this Data Book have been updated to reflect the most recent data available.