Great call Hank!!,
There have been a number of "Fire Incidents" here in New Zealand over the last few years with trees drying out.
Couple that with a bad connection at one of the lamp-holders on the Xmas lights and you have an instant powder-keg.
The NZ Fire Service has done extensive trials here during "house-burns" and the numbers that you have submitted, ring very true with what we have here.
One other thing, is make sure the lights on your tree this year, have the lamps well seated into the bases.
For some wierd reason, these fires start at night.
Don't leave your Xmas lights on overnight.
Having a tree like this catch fire, is like having a stack of kindling in the corner of your living room.