-75.41% is the change from 850 to 209
Calculation steps:
[( 209 - 850 ) ÷ 850] x 100 = -75.41%
Formula
Percentage change = [(209 - 850) / 850] x 100
Subtract the new number by the original number
209 - 850 = -641
-641 ÷ 850 = -0.7541176470588236
-0.7541176470588236 x 100 = -75.41%