-80.02% is the change from 851 to 170
Calculation steps:
[( 170 - 851 ) ÷ 851] x 100 = -80.02%
Formula
Percentage change = [(170 - 851) / 851] x 100
Subtract the new number by the original number
170 - 851 = -681
-681 ÷ 851 = -0.800235017626322
-0.800235017626322 x 100 = -80.02%