Probation and Parole in the United States, 2006 / US. Bureau of Justice Statistics, 5 December 2007
http://www.ojp.usdoj.gov/bjs/abstract/ppus06.htm
"Presents the number of persons on probation and parole at yearend 2006, by State, and compares the national totals to counts for yearend 1995 and 2000 through 2005. The report provides State-level probation and parole supervision rates at yearend 2006 and the percentage change in each population during the year. It presents probation and parole entries and exits, by State, and it provides national and State-level data on parole revocations. The Bulletin also includes a national description of the race, gender, and offense composition of these populations."