-25.09% is the change from 853 to 639
Calculation steps:
[( 639 - 853 ) ÷ 853] x 100 = -25.09%
Formula
Percentage change = [(639 - 853) / 853] x 100
Subtract the new number by the original number
639 - 853 = -214
-214 ÷ 853 = -0.2508792497069168
-0.2508792497069168 x 100 = -25.09%