-21.92% is the change from 853 to 666
Calculation steps:
[( 666 - 853 ) ÷ 853] x 100 = -21.92%
Formula
Percentage change = [(666 - 853) / 853] x 100
Subtract the new number by the original number
666 - 853 = -187
-187 ÷ 853 = -0.21922626025791325
-0.21922626025791325 x 100 = -21.92%