-21.55% is the change from 849 to 666
Calculation steps:
[( 666 - 849 ) ÷ 849] x 100 = -21.55%
Formula
Percentage change = [(666 - 849) / 849] x 100
Subtract the new number by the original number
666 - 849 = -183
-183 ÷ 849 = -0.21554770318021202
-0.21554770318021202 x 100 = -21.55%