Rob Hall (GM Southern NZHPT) gave a PowerPoint presentation to the Christchurch City Council (12th Feb 2014). The PowerPoint (converted to images) includes pie chart diagrams that illustrate the proportion of registered heritage buildings lost and those that are still at risk.
“RMA section 32 interim guidance now available” Ministry For The Environment
"The Ministry for the Environment has produced an interim guide to section 32 of the RMA as a result of changes made by the Resource Management Amendment Act 2013...."
http://www.mfe.govt.nz/publications/rma/guide-s32-resource-management-act-changes.html