-28.76% is the change from 897 to 639
Calculation steps:
[( 639 - 897 ) ÷ 897] x 100 = -28.76%
Formula
Percentage change = [(639 - 897) / 897] x 100
Subtract the new number by the original number
639 - 897 = -258
-258 ÷ 897 = -0.28762541806020064
-0.28762541806020064 x 100 = -28.76%