From the Census Bureau:
This quarterly survey (formerly known as the Finances of Selected State and Local Government Employee Retirement Systems Survey) provides national summary statistics on the revenues, expenditures and composition of assets of the 100 largest state and local public employee retirement systems in the United States. These 100 systems comprise 89.4 percent of financial activity among such entities, based on the 2007 Census of Governments. This survey presents the most current statistics about investment decisions by state and local public employee retirement systems, which are among the largest types of institutional investors in the U.S. financial markets. These statistical tables are published three months after each calendar quarter and show national financial transactions and trends for the past five years.