-78.3% is the change from 857 to 186
Calculation steps:
[( 186 - 857 ) ÷ 857] x 100 = -78.3%
Formula
Percentage change = [(186 - 857) / 857] x 100
Subtract the new number by the original number
186 - 857 = -671
-671 ÷ 857 = -0.7829638273045507
-0.7829638273045507 x 100 = -78.3%