Yes, mine went up 4000%, NO that is NOT a typo. 
I appealed, and "won" 
got it cut in half YEAH !
Next year - guess what went up the 1/2
Appealed and "won"
got it cut in half  
3rd year it went up
You guessed it
up the amount cut
Appealed
Cut in half
4th year same deal
So, in 4 years despite appealing and "winning"

They got their 4000% increase