Not actually sure but it's so low in with the rest of the vehicle/building/life/etc that I don't know. 

 I will say that I asked my insurance company what it would cost to insure myself to spray a few miles of railway right-of-way for a hobby group and they wanted $2500 for a one-shot deal and over $10,000/yr if I wanted to do more.  I almost fell over!  Ag stuff is cheap in comparison to the industrial liability.  And yes I'm Canadian too.