"After the February 2011 earthquake, 800 Christchurch residents moved overseas in May 2011," Statistics NZ said. "And 500 Christchurch residents moved overseas in May 2012, the same as in May 2010."
Four hundred migrants settled in Christchurch last month, up from 100 a year earlier. On an annual basis, the number of short-term visitor arrivals rose 1 per cent to 140,800, with a 51 per cent increase in visitors from China to 12,900, the highest-ever.
Visitors from Japan rose 20 per cent to 3000, showing a partial recovery toward the May 2010 level of 5300 visitors after Japan's own earthquake and tsunami in March 2011.
ASB economist Daniel Smith said particularly noticeable was that UK visitor numbers were about 18 per cent lower than in May 2011.
"Unfortunately this does not appear to be a one-off; since the RWC visitor numbers from the UK and the rest of Europe have dropped markedly on a seasonally adjusted basis."
Economic problems in Europe were likely to suppress visitor numbers from the region for the foreseeable future. Overseas trips by New Zealand residents fell by 2500 to 179,300, compared with a year earlier.