Note: The annual net increase in the funds is the change in the asset reserves from the end of one year to the end of the next. In 1982, the Old-Age and Survivors Insurance (OASI) Trust Fund borrowed money from the Hospital Insurance Trust Fund, and repaid the borrowed amounts in 1985 and 1986. For each of these years, the net increase in the funds is equal to total income less total cost, plus amounts borrowed or less amounts repaid. Asset reserves, except for relatively small cash amounts, are invested in Federal Government securities. For trust fund data prior to 1957, see OASI data (the Disability Trust Fund was established in 1957).