The Social Security Administration operates two disability benefit programs: Social Security Disability Insurance (SSDI) for disabled workers and Supplemental Security Income (SSI) for disabled impoverished adults and children. The SSDI program was enacted in 1956, SSI in 1972. In the year 2000 $50 billion cash benefits were paid under SSDI and $19 billion under SSI. This represents a 75% increase in benefits from 1989 to 2000. Disability allowance rates, that is, awards as a percentage of applications, have varied over time from 31% in 1980 to 47% in 2000. The allowance rate is influenced by legislative changes and judicial decisions. It varies from state to state, from decision maker to decision maker, and according to the adequacy of resources to process and review claims.