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.

NZHPT PowerPoint Presentation To The C.C.C. Eathquake Recovery Committee Of The Whole (12th Feb 2014)