Table 16 from USCG Recreational Boating Statistics 2012. This is the table that is often confused and accepted as representing the total number of reported accidents, but it only includes Primary (or Event 1) accidents.
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart
Four Volume Review of the Boating Industry’s Boat Propeller Guard Product Liability Defense