Since you asked. About 40,000
Since you asked. About 40,000 LEAF's on the roads compared to 20,000 Tesla Model S's.
LEAF hit the streets on Dec 2010, Model S Aug 2012.
More LEAF's, been driving on the roads longer longer. It still raises the question why two debris fires for the Model S with none for the LEAF? Lower slung and higher speeds are my guess.
BTW the Tesla fires are more of an insurance risk than a safety threat since the fires come after ample warning of impending doom for the vehicle.