Just over 1.1% of the NZ population – 50,115 left NZ permanently last year for Australia. Only 14,300 made the reverse trip. The primary motivation is economic with more jobs and higher pay. Over the last 8 years the net migration total is 203,654.
Being one of those who voted with his feet I completely understand it. It wasnt until I left both Australia and NZ, moving to Europe that I could actually save money.