Year-end level from ICI, Investment Company Factbook, Table 58 Total Net Assets of Institutional Investors in Mutual Funds by Type of Institution and Type of Fund, column Business corporations, Money market funds. Quarterly levels are estimated from a growth rate of total assets held by retail and institutional investors. The growth rate is calculated as the sum of the respective growth rates of retail and institutional investors from ICI weekly data on Money Market Mutual Funds Assets, each weighted by its proportional share of all taxable money market funds for the previous year-end from ICI, Investment Company Factbook, Table 58 Total Net Assets of Institutional Investors in Taxable Money Market Funds by Type of Institution and Type of Funds, column Business corporations. Unadjusted flow is the change in the level; data for the most recent ten years show no significant seasonality.
