-75.5% is the change from 857 to 210
Calculation steps:
[( 210 - 857 ) ÷ 857] x 100 = -75.5%
Formula
Percentage change = [(210 - 857) / 857] x 100
Subtract the new number by the original number
210 - 857 = -647
-647 ÷ 857 = -0.7549591598599766
-0.7549591598599766 x 100 = -75.5%