-10.2% is the change from 853 to 766
Calculation steps:
[( 766 - 853 ) ÷ 853] x 100 = -10.2%
Formula
Percentage change = [(766 - 853) / 853] x 100
Subtract the new number by the original number
766 - 853 = -87
-87 ÷ 853 = -0.10199296600234467
-0.10199296600234467 x 100 = -10.2%