Troops and Happiness question

[psimancer]

ok so i can shoot empty colonies thus removing them (its gotta have a base hitpoint value which i damage
thus the empty colonie structures are destroyed

now back on original question target the happiness txt file lists "Our Troops on Planet := -2" is that minus 2 per troop per turn (for those who don't know rioting is positive 100 happiness value unmodded)
and if so then 10 troopes would subtract 20 per turn thus dropping from riot(100) to angry(74) in 2 turns (if those are the actual numbers at the time)
is this correct ???