As the growing colony had a great shortage of labor, were in the period 1850-1868 but then about 10,000 convicts used for the construction of public facilities.
Kama koloni la kuongezeka alikuwa na uhaba mkubwa wa ajira, walikuwa katika kipindi cha 1850-1868 lakini basi kuhusu wafungwa 10,000 kutumika kwa ajili ya ujenzi wa vituo vya umma.