Banks have adopted new technologies in order to reduce operating costs. The rollout of automated teller machines (ATMs) commenced in 1969. There are currently a number of ATM networks operating in Australia, the largest five of which are: the Commonwealth Bank-Bankwest network (with over 4,000 machines), NAB-rediATM network (with over 3,400 machines), Westpac-St.George-BankSA and Bank of Melbourne network (with over 3,000 machines), ANZ (with over 2,600 machines) and Suncorp (with over 2,000 machines), and others. Financial institutions are linked via interbank networks.