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In page Foreign relations of New Zealand:

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Britain's entry into the European Economic Community in 1973 forced New Zealand into a more independent role.[1] The British move restricted New Zealand's trade access to its biggest market, and it sought new trading partners in Asia, America and the Middle East. Australia and New Zealand signed the free-trade Closer Economic Relations agreement in 1983. The election of the Fourth Labour Government in 1984 marked a new period of independent foreign policy. Nuclear-powered and nuclear-armed ships were banned from New Zealand waters, effectively removing New Zealand from the ANZUS pact. Immigration laws were liberalised, leading to a massive increase in immigration from Asia. The Fourth National Government (1990–1999) liberalised trade by removing most tariffs and import restrictions.