I don't know for a fact, but hopefully I can help you out a bit
When I got my protege5 it had stock tints that were TERRIBLY faded and just looked like garbage (im guessing these were stock but I have no way of knowing)
since they were so faded, they barely looked like tints but I would say it was around 50% stock most likely
On the windshield there is only a factory tint strip above the AS1 line... don't know the percent either but I do know for a fact that the entire windshield does not come factory tinted.. and I high reccommend against tinting your windshield, it is hard to see at night and is asking to get pulled over..
Since then, I stripped off all the tints and put 20% tint all the way around (all windows, hatch) and am going to do a limo tint (5%) strip on the windshield above the AS1 line this summer.
35% is legal in my state, but so far I have been fine with 20's, no problems yet..
Still debating to myself if it would be worth it to limo tint the sun roof/moon roof
Hopefully this helped