The Constitutional Budget Reserve (CBR) is a companion fund to the Permanent Fund which was established in 1991 to ease problems from the variability of oil revenue, which vary depending upon the price of oil in the market. Deposits into the CBR consist of settlements of back taxes and other revenues owed to the state. Draws from the CBR into the general fund require a 3/4 vote of each house of the legislature and must be repaid. To date, the general fund has amassed a debt of approximately $4 billion to the CBR to maintain a stable level of public spending.