While the funded status of single-employer corporate defined benefit pension plans has improved, the funded status of multiemployer union pension plans has remained stagnate and, in some cases, further deteriorated. The Pension Benefits Guaranty Corporation recently reported to Congress that the aggregate funding ratio of all multiemployer plans was 48 percent. From the most recent data available, the PBGC reports that multiemployer pension plans have $366 billion in assets to satisfy $757 billion in vested liabilities—in short, a funding deficit of $390 billion.