So, by my reckoning......and a very quick calculation....if, the draft of 2016 is not considered in this calculation (even though all 4 will play 50 games) AND, we assume Weller, Blakely, and Langdon play 50 games for the Club (I am not yet counting Deluca, but hopeful).....
...that makes 74 National Draft Picks between 2000 -2015. Of those, 32 played 50 games for Freo.
That makes 43% !
Goes to 46 % if the class of 2016 get through to 50...
(ed....Apologies for any mistakes I have made during this quick summary....)