The number of indigenous adults held in the nation’s jails has increased for the 11th year in a row, despite the nation's prisoner population falling for the first time in a decade.

According to the latest Australian Bureau of Statistics data, the indigenous prisoner population increased by 1% in the year to June 2011 while the total prisoner population dropped by 2%. The gap between indigenous and non-indigenous imprisonment rates grew by 0.1%, with indigenous Australians now 14.3 times more likely to be incarcerated than non-indigenous Australians. Today, about one in four prisoners are indigenous even though indigenous Australians make up just 2.5% of the general population.