-40.94% is the change from 977 to 577
Calculation steps:
[( 577 - 977 ) ÷ 977] x 100 = -40.94%
Formula
Percentage change = [(577 - 977) / 977] x 100
Subtract the new number by the original number
577 - 977 = -400
-400 ÷ 977 = -0.4094165813715456
-0.4094165813715456 x 100 = -40.94%