-21.94% is the change from 857 to 669
Calculation steps:
[( 669 - 857 ) ÷ 857] x 100 = -21.94%
Formula
Percentage change = [(669 - 857) / 857] x 100
Subtract the new number by the original number
669 - 857 = -188
-188 ÷ 857 = -0.2193698949824971
-0.2193698949824971 x 100 = -21.94%