New Zealand / 2013 66% open

NZ national map is available as both vector and raster data. http://creativecommons.org/licenses/by/3.0/nz/

http://www.electionresults.govt.nz/about.html allows reuse with attribution, but this isn't obvious with the All Rights Reserved claim in the footer of the homepage.

Legislation is available in machine readable format (XML) and in bulk (all publicly available legislation) here: http://www.legislation.govt.nz/subscribe

Unfortunately, Postcode data is managed by NZ Post, a state-owned enterprise, with a commercial model. The Postcode Network File is $400-$2100/year depending on use and the license restricts reuse.

Air quality data is gathered by regional councils and aggregated by Ministry for the Environment. Some councils, such as ECAN, make realtime air quality data available (see http://data.ecan.govt.nz/Catalogue/Search?Query=&CollectionId=4 ). At Ministry for the Environment I could only find prepared charts and commentary, not raw data (see http://www.mfe.govt.nz/environmental-reporting/air/air-quality-indicator/index.html ). No air data sets were visible at https://data.govt.nz/catalog/?AgencySearch=Ministry+for+the+Environment+%28MfE%29&action_doCustomSearch=Go&agency=true&rpp=25

Metlink data covers Wellington region only but is provided by KiwiRail http://www.kiwirail.co.nz/travel. There is no national government bus service.

Only Budget Data exists, no evidence of Spending Data at a transactionnal level.