When did Austronesian speakers move around New Guinea into the western Pacific?

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Austronesian speakers moved around the northern coast of New Guinea into the western Pacific approximately 2000 BCE.1

These populations, associated with the Lapita culture, arrived by sea from Southeast Asia. By 3500 years ago, they had established themselves in parts of the Bismarck Archipelago, and from that region, they fanned out rapidly across the Pacific using sophisticated maritime technology.21