Zealand to Australia, including former Premier of South Australia, Mike Rann, comedian turned psychologist Pamela Stephenson and actor Russell Crowe. Australians who have emigrated to New Zealand include the 17th and 23rd Prime Ministers of New Zealand Sir Joseph Ward and Michael Joseph Savage, Russel Norman, former co-leader of the Green Party, and Matt Robson, former deputy leader of the Progressive Party. Under various arrangements since the 1920s, there has been a free flow of people between Australia and New Zealand. Since 1973 the informal Trans-Tasman Travel Arrangement has allowed for the free movement of citizens of one nation to the other. The only major exception to these travel privileges is for individuals with outstanding warrants or criminal backgrounds who are deemed dangerous or undesirable for the migrant nation and its citizens. New Zealand passport holders are issued with special category visas on arrival in Australia, while Australian passport holders are issued with residence class visas on arrival in New Zealand. In recent decades, many New Zealanders have migrated to Australian cities such as Sydney, Brisbane, Melbourne and Perth. Many such New Zealanders are Māori Australians. Although this agreement is reciprocal there has been resulting significant net migration from New Zealand to Australia. In 2001 there were eight times more New Zealanders living in Australia than Australians living in New Zealand, and in 2006 it was estimated that Australia's real income per person was 32 per cent higher than that of New Zealand and its territories. Comparative surveys of median household incomes also confirm that those incomes are lower in New Zealand than in most of the Australian States and Territories. Visits in each direction exceeded one million in 2009, and there are around half a million New Zealand citizens in Australia and about 65,000 Australians in New Zealand. There have been complaints in New Zealand that there is a clearly manifested brain drain to Australia. 2001 Australian immigration policy changes New Zealanders in Australia previously had immediate access to Australian welfare benefits and were sometimes characterised as bludgers. In 2001 this was described by New Zealand Prime Minister Helen Clark as a "modern myth". Regulations changed in 2001 whereby New Zealanders must wait two years before being eligible for such payments. All New Zealanders who have moved to Australia after February 2001 are placed on a Special Category Visa, classing them as temporary residents, regardless of how long they