-15.87% is the change from 857 to 721
Calculation steps:
[( 721 - 857 ) ÷ 857] x 100 = -15.87%
Formula
Percentage change = [(721 - 857) / 857] x 100
Subtract the new number by the original number
721 - 857 = -136
-136 ÷ 857 = -0.15869311551925322
-0.15869311551925322 x 100 = -15.87%