Historical rankings of Prime Ministers of Australia teaching or researching in the fields of Australian politics or history" to place Australia's prime ministers in five categories; 40 responded. Five points were awarded to prime ministers judged "outstanding", four for those considered "good", three for "average", two for "below average", and one for "failure". The three caretaker prime ministers were excluded from consideration, as was the serving prime minister, Julia Gillard. John Curtin received the highest average rating, 4.78, and he was the only prime minister who no respondents gave a rating lower than "good". It is possible to compare the highest approval ratings achieved by Prime Ministers
Julia Gillard as "Minister for Population" to that of "Minister for Sustainable Population". The Government released a "sustainable population strategy" in May 2011 which did not specify a target population. In October 2011 trade minister Craig Emerson released a paper with Gillard's approval which advocated for continued rapid rates of population growth. After winning leadership of the Labor Party, Gillard identified addressing the issue of unauthorised arrivals of asylum seekers as a priority of her government. She announced that negotiations were underway for a return to "offshore processing" of asylum seeker claims. Gillard ruled out a return to processing at Nauru and