Annual Statistical Report on the Social Security Disability Insurance Program 2007
http://www.ssa.gov/policy/docs/statcomps/di_asr/2007/index.html
Provides information about the history and benefits of the program, the appeals process, and provides statistics for benefits paid over the past year. Disability benefits were paid to 8.1 million people and the average monthly benefit received was just over $1,000. From the Social Security Administration.