I checked all the flours in my pantry and this is what I discovered in protein percentages:
All Purpose. King Arthur 11.7%
Bread Flour. King Arthur 12.7%
Whole Wheat King Arthur 13.8%
Gold Medal All Trumps High Gluten Flour 14.2%
Tipo "00" Flour 13%
Semolina. King Arthur 14.2%
Organic Rye Flour King Arthur 10%