Japan: the IPSS 2017 projection expected foreign nationals' net migration of +690k for 2016–2025; the outcome was +1.75M
5 projections of IPSS (Japan's National Institute of Population and Social Security Research) against the facts over the years each has covered (sums over those years): the outcome came in above the projection in all 5. The largest miss: IPSS 2017 expected +690k for 2016–2025; the outcome was +1.75M.
Source: National statistical offices: projections and actual dataOpen on the chart →