STATISTICS NEW ZEALAND http://www.stats.govt.nz/
Includes links to:
You can also 'browse for statistics' by category.
See also: NZ Statistics Subject Guide
GOVERNMENT AGENCIES
Many government agencies provide data and statistics on their area of interest.
For example:
https://otago.libguides.com/nz_statistics
Find statistical information and data from historic to current, using databases, online data sources and publications