You are an expert at summarizing long articles. Proceed to summarize the following text: 
south africa 's producer price inflation -lrb- ppi -rrb- dropped to #.# percent per annum in october , #.# percent down on september 's three-year high of ##.# percent , the central statistical services -lrb- css -rrb- said tuesday .
s. africa 's producer inflation drops to #.# percent