Prime Minister of New Zealand signed a number of international treaties. In 1967, Keith Holyoake became the first New Zealand prime minister to select candidates for the position of governor-general without any involvement of the British government. Holyoake advised the monarch, Queen Elizabeth II, to appoint Sir Arthur Porritt, the first New Zealand–born governor-general. After the mixed-member proportional (MMP) system was introduced in 1996, prime ministers have had to manage minority governments. The skill of MMP management was exemplified by Helen Clark's nine years as prime minister (1999–2008), when her Labour Party remained in power thanks to a range of confidence and supply agreements with
Helen Clark by secret ballot in October 2016. Clark finished fifth place in the sixth poll—her candidacy was effectively vetoed when three of the permanent Security Council members voted against her. Clark's bid for Secretary-General is the topic of a documentary film, "My Year With Helen", directed by Gaylene Preston, which premiered in February 2018. Clark was brought up as a Presbyterian Christian, attending Sunday school weekly. When she was Prime Minister she described herself as an agnostic. She married sociologist Peter Davis, her partner of five years in 1981, shortly before she was elected to Parliament. Clark had been under pressure