-9.73% is the change from 853 to 770
Calculation steps:
[( 770 - 853 ) ÷ 853] x 100 = -9.73%
Formula
Percentage change = [(770 - 853) / 853] x 100
Subtract the new number by the original number
770 - 853 = -83
-83 ÷ 853 = -0.09730363423212192
-0.09730363423212192 x 100 = -9.73%