-74.59% is the change from 850 to 216
Calculation steps:
[( 216 - 850 ) ÷ 850] x 100 = -74.59%
Formula
Percentage change = [(216 - 850) / 850] x 100
Subtract the new number by the original number
216 - 850 = -634
-634 ÷ 850 = -0.7458823529411764
-0.7458823529411764 x 100 = -74.59%