^* The 1998 prison custody count was estimated and rounded to nearest 100.

— Data not available.

Source: Bureau of Justice Statistics Bulletin. Prisoners in 1998 (August 1999), Prisoners in 1997 (August 1998). Correctional Populations in the United States, 1995; 1994; 1993; 1992; 1991; 1990; 1989. Jails and Jail Inmates, 1993-94. Jail Inmates, 1992; 1990. Data for 1997 percentages of drug offenders are estimated from Bureau of Justice Statistics Special Report, Substance Abuse and Treatment, State and Federal Prisoners, 1997. (January 1999).