Does anyone know where I can get the Zimbabwe's national average rainfall (mm/yr)? Ideally data from the Zimbabwe Meteorological Services (which is available for a fee I believe). The following link shows a graph of the data I am after, although I don't require it any earlier than the 1970s.

http://ntoz.org/cop-23-climate-change-consequences-for-the-national-trust-of-zimbabwe/

http://ntoz.org/wp-content/uploads/2017/11/GRAPH.png

Required for a research assignment I am completing, any help would be greatly appreciated.