-19.58% is the change from 771 to 620
Calculation steps:
[( 620 - 771 ) ÷ 771] x 100 = -19.58%
Formula
Percentage change = [(620 - 771) / 771] x 100
Subtract the new number by the original number
620 - 771 = -151
-151 ÷ 771 = -0.19584954604409857
-0.19584954604409857 x 100 = -19.58%