-58.87% is the change from 970 to 399
Calculation steps:
[( 399 - 970 ) ÷ 970] x 100 = -58.87%
Formula
Percentage change = [(399 - 970) / 970] x 100
Subtract the new number by the original number
399 - 970 = -571
-571 ÷ 970 = -0.588659793814433
-0.588659793814433 x 100 = -58.87%