U.S. Coast Guard 2013 Recreational Boating Statistics Table 17, version 2 (as captured 11 June 2014). This version switches the data rows for struck by boat and struck by propeller.
Aspects of the Propeller Safety Debate chart
Houseboat Propeller Regulation Proposed and Withdrawn by USCG: Analysis by PGIC
History of Boat Propeller Safety
Mitigating Boat Propeller Injuries & Fatalities Chart