"During 2005 the number of females under the jurisdiction of State or Federal prison authorities increased by 2.6% (table 5). The number of males in prison rose 1.9%. At yearend 2005, 107,518 females and 1,418,406 males were in prison. Since 1995 the annual rate of growth in female prisoners averaged 4.6%, which was higher than the 3.0% increase in male prisoners. By yearend 2005 females accounted for 7.0% of all prisoners, up from 6.1% in 1995 and 5.7% in 1990."
Harrison, Paige M. & Allen J. Beck, PhD, Bureau of Justice Statistics, Prisoners in 2005 (Washington DC: US Department of Justice, Nov. 2006), p. 4.