The Cossacks also carried out the second strategical objective, the colonisation of the Kuban land. In total, the host owned more than six million tithes, of which 5.7 million belonged to the stanitsas, with the remaining in the reserve or in private hands of Cossack officers and officials. Upon reaching the age of 17, a Cossack would be given between 16 and 30 tithes for cultivation and personal use. With the natural growth of the population, the average land that a Cossack owned decreased from 23 tithes in the 1860s to 7.6 in 1917. Such arrangements, however ensured that the colonisation and the cultivation would be very rational.