The single transferable vote (STV), a multi-seat variation of IRV, is used for all district health board elections. Starting in 2004, several New Zealand cities and local authorities began to use STV for their elections—including the nation's second largest city and capital Wellington and its fifth largest city Dunedin Where electing a mayor directly, these cities used instant runoff voting. In 2007, for example, Wellington's mayor Kerry Prendergast defeated her 10 rivals on the 9th round of counting. Other contested IRV races have included the 2010 Dunedin mayoral election and 2010 Wellington City mayoral election.